Hi. I guess you can add 3 Image Blocks >> then add links?
No need to use Portfolio Page.
If you still want to use Portfolio page, add this code to Settings > Advanced > Code Injection to change Converge Academy url.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
$('a.grid-item[href*="academy"]').attr('href','https://beaverhero.com');
});
</script>
Replace beaverhero with new external site url
