Sign in with your Facebook account. Gun Bros will automatically add your Facebook friends that have Gun Bros installed to your "Bros" list
you must have a game center account and then you get friends on game ceneter. if you also play gun bros then they should pop up on your list. the time it takes for them to pop up might be 5minutes to a 10 days.
you can't you can only if you have wi-fi and game center friends that have gun bros
If you have bros in your brotherhood then they send you rewards that are money or other stuff you buy in gun bros and those rewards are called gifts
you cant
Get Google Chrome than install web store than get gun bros there
The Iphone
200
Restart the app then press the red box that says " offline" it will tell you to create a game center account then just click the link.
Just press on your character or the number next to it
you dont
yes via facebook
you can play mario bros with portal gun online