How do I add friends in Game Center?

I want to invite my friends to compete with me in some iPhone games, how do I do it in Game Center?

How to add friends in Game Center on iPhone and iPad.

Game Center lets you create a list of friends that you can then invite to play in multiplayer games and compare scores and achievements with. To add a friend open Settings -> Game Center and tap on invite friends. It will automatically create a text message invite, you just have to fill out who it will send to.

How to add friends in Game Center on iPhone and iPad.
How to add friends in Game Center on iPhone and iPad.