Snapguide
STEPS
TOOLS
Open settings> scroll down to Game Center

Open settings> scroll down to Game Center

Tap you current name and sign in

Tap you current name and sign in

Change your name XD                       o(\u2267\u25bd\u2266)o

Change your name XD o(≧▽≦)o

That's all there is to it! :)

The creator of this guide has not included tools