How to insert save to favourites feature link within modal?

I am using the NASA API which displays images, and when the image is clicked, it displays a modal with the images and details of the image.

However, in the tutorial, there is a save to favourites feature that adds the image and details to the favourites section into local storage.

My question is, how do I implement the add to favourites feature link into the modals, and then save the image and details to the local storage favourites section?

https://jsfiddle.net/ha0j3c6u

The tutorial with the save to favourite feature - https://jacintodesign.github.io/nasa-api-pictures

const resultsNav = document.getElementById("resultsNav");
const favoritesNav = document.getElementById("favoritesNav");
const imagesContainer = document.querySelector(".images-container");
const saveConfirmed = document.querySelector(".save-confirmed");
const loader = document.querySelector(".loader");

// NASA API
const count = 3;
const apiKey = 'DEMO_KEY';
const apiUrl = `https://api.nasa.gov/planetary/apod?api_key=${apiKey}&count=${count}`;

let resultsArray = [];
let favorites = {};

// Show Content
function showContent(page) {
  window.scrollTo({
    top: 0,
    behavior: "instant"
  });
  if (page === "results") {
    resultsNav.classList.remove("hidden");
    favoritesNav.classList.add("hidden");
  } else {
    resultsNav.classList.add("hidden");
    favoritesNav.classList.remove("hidden");
  }
  loader.classList.add("hidden");
}

// Create DOM Nodes
function createDOMNodes(page) {
  const currentArray =
    page === "results" ? resultsArray : Object.values(favorites);
  currentArray.forEach((result) => {
    // Card Container
    const card = document.createElement("div");
    card.classList.add("card");




    // Link that wraps the image
    const link = document.createElement("a");


    // Get the modal
    var modal = document.getElementById("myModal");

    // Get the image and insert it inside the modal - use its "alt" text as a caption
    var img = document.getElementById("myImg");
    var modalImg = document.getElementById("img01");

    var captionText = document.getElementById("caption");
    img.onclick = function() {
      modal.style.display = "block";



      modalImg.src = event.target.src;
      captionText.innerHTML = event.target.alt;

    }

    // Get the <span> element that closes the modal
    var span = document.getElementsByClassName("close")[0];

    // When the user clicks on <span> (x), close the modal
    span.onclick = function() {
      modal.style.display = "none";
    }


    // Image
    const image = document.createElement("img");
    image.src = result.url;
    // image.alt = "NASA Picture of the Day";
    image.alt = result.title + "<br>" + result.explanation + "<br>" + ' ' + result.date;
    image.loading = "lazy";
    image.classList.add("card-img-top");


    // Card Body
    const cardBody = document.createElement("div");
    cardBody.classList.add("card-body");

    // Card Title
    const cardTitle = document.createElement("h5");
    cardTitle.classList.add("card-title");
    cardTitle.textContent = result.title;

    // Save Text
    const saveText = document.createElement("p");
    saveText.classList.add("clickable");
    if (page === "results") {
      saveText.textContent = "Add To Favorites";
      saveText.setAttribute("onclick", `saveFavorite('${result.url}')`);
    } else {
      saveText.textContent = "Remove Favorite";
      saveText.setAttribute("onclick", `removeFavorite('${result.url}')`);
    }

    // Card Text
    const cardText = document.createElement("p");
    cardText.textContent = result.explanation;

    // Footer Conatiner
    const footer = document.createElement("small");
    footer.classList.add("text-muted");

    // Date
    const date = document.createElement("strong");
    date.textContent = result.date;

    // Copyright
    const copyrightResult =
      result.copyright === undefined ? "" : result.copyright;
    const copyright = document.createElement("span");
    copyright.textContent = ` ${copyrightResult}`;

    // Append everything together
    footer.append(date, copyright);
    cardBody.append(cardTitle, saveText, cardText, footer);
    link.appendChild(image);
    card.append(link); // hide cardBody

    // Append to image container
    imagesContainer.appendChild(card);
  });
}

// Update the DOM
function updateDOM(page) {
  // Get favorites from local storage
  if (localStorage.getItem("nasaFavorites")) {
    favorites = JSON.parse(localStorage.getItem("nasaFavorites"));
  }
  imagesContainer.textContent = "";
  createDOMNodes(page);
  showContent(page);
}

// Get 10 images from NASA API
async function getNasaPictures() {
  // Show Loader
  loader.classList.remove("hidden");
  try {
    const response = await fetch(apiUrl);
    resultsArray = await response.json();
    updateDOM("results");
  } catch (error) {
    // Catch Error Here
  }
}

// Add result to favorites
function saveFavorite(itemUrl) {
  // Loop through the results array to select favorite
  resultsArray.forEach((item) => {
    if (item.url.includes(itemUrl) && !favorites[itemUrl]) {
      favorites[itemUrl] = item;
      // Show save confirmation for 2 seconds
      saveConfirmed.hidden = false;
      setTimeout(() => {
        saveConfirmed.hidden = true;
      }, 2000);
      // Set Favorites in Local Storage
      localStorage.setItem("nasaFavorites", JSON.stringify(favorites));
    }
  });
}

// Remove item from favorites
function removeFavorite(itemUrl) {
  if (favorites[itemUrl]) {
    delete favorites[itemUrl];
    localStorage.setItem("nasaFavorites", JSON.stringify(favorites));
    updateDOM("favorites");
  }
}

// On Load
getNasaPictures();

from How to insert save to favourites feature link within modal?