I made a few custom cards I want to share but I don’t know how to add images, does anyone know how to do that or will I just have to do it in text?
You probably want to post them on r/customhearthstone, the subreddit for custom hearthstone.
New accounts can’t post images or links. If you want to share custom cards, you can post a link to the image posted on an image-hosting site like imgur. All you need to do is put the link between Preformatted text tags (the </> button on your formatting bar). This will allow you to post the link in it’s entirety, without having to edit the link to bypass the forum filters.