Hello, i am new and I don't really know how it works but I'd like to add a game, but as I said I don't really know how, if someone could explain me how to do it or, even if is possible?

Your account needs to be 7 days old I believe.

http://speedrun.com/requestgame

Read all the rules. And yes, your account needs to be at least 7 days old.

https://www.speedrun.com/requestgame

Read all the moderation rules and detailed game request rules first. The 7 days old account rule is one of many. (I happen to post several duplicate posts with others for some reason)