How can I customize the Icon of a thread in finished games?

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1

Hello everyone! I reccently finished a game and posted in the forum,in the area ‘finished games’,obviously,but I reccognized that the most of the posts there had in the Icon,an image that represents the game on it,so I wanted to do it with mine,but I don’t know how to do it
Please,can someone answer this simple question? It’s very important for me to know that

2

Attach an image to the first post in the thread, that is the image that shows up against your thread

3

Ok,I’m gonna try it,thanks

4

You need to actually upload an image to the site (insert image icon), not from some other site url