If you want to use a screenshot in your post, go to that image and copy the the link that looks like this (this one is broken up to make Steam let you see the text, instead of replacing it with the image):
https:// steamcommunity. com/sharedfiles /filedetails /?id=2958615221

It adds the image inline, which looks like this:
https://steamcommunity.com/sharedfiles/filedetails/?id=2958615221

You can get that url by clicking on the screenshot in steam, then clicking on the picture in the little window it pops up to "fully" open the picture.