How to restore an iPhone 4s?

Do I need an iTunes account or can I use my friends? Because he said he can do it for me? Like can it be restored on any iTunes account or does it have to be a specific one?

It can be restored on any computer as long as it has iTunes.

Oh it's actaully pretty easy.first of all yes you can use your friends itunes account but be careful not to synce her stuff onto yours.second of all you need to connect your iphone to an itunes then go to summary then click restore then after it's resotred you can get all the stuff back if you have backed up your stuff on itunes and no you do not need an account to use itunes i think