Hello RosanneDignin,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
iOS: Changing the signed-in iTunes Store Apple ID account
http://support.apple.com/kb/ht1311
Changing your Apple ID account
Tap Settings > iTunes & App Stores, then tap the Apple ID signed in.
Sign out of the current Apple ID account and then sign in with another account or create a new Apple ID.
Best of luck,
Mario