I forgot my iTunes password

By your iTunes password, I am assuming you mean the Apple ID you use to log in to the store? You can go to the following website and see about resetting your password. If you don't remember the password, you will need to be able to answer your security questions in order to access your account.

https://appleid.apple.com/#!&page=signin

or

https://iforgot.apple.com/password/verify/appleid

I hope this helps!