Ignore this please. Sorry but I misunderstood the 'Game Posting' option. I thought it was for others to upload games to the site for inclusion to the arcade...which in thinking about it wouldn't really be that safe...although when you download from other sites they might not be safe either.
Anyway the upshot is you can delete this post if you want to
Game posting is just for announcing newly installed games.
In the arcade admin you set a user id and a board to post the new games.
For example you can create a new user named "Arcade Bot", give it an arcade themed avatar and use that as the user id.
(https://www.quizland.co.uk/Smileys/dave/thumbs_up1.gif)