Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics
SalesBundles
Jobs
Tags

OK yeah I can't get this to work in the forum either. The announcement post says

For those using the rich text editor, you will have to manually edit the HTML to add the class at the time being.

But I can't see how to edit the HTML of a forum post or devlog post, only the game page itself.