We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
It depends on the game. Usually you can just connect a 2nd controller, and you'll have the option in the main menu (If the game even supports split-screen to begin with). If you say which game, I or someone else can probably
help you a lot more.
To go along with "Elite Effect" suggestion, make sure that the game you're playing is also Multiplayer. To finds out, just look behind the case of the game and see if it's available for 2 or more players