Welcome to Apple Support Communities.
If you need to sign in to iCloud or the iTunes Store with your own Apple ID, see this article for help:
Here's how to sign in and out of your Apple ID on an iPhone:
1. When you first set up your device with iOS 5 or later, enter the Apple ID you want to use with iCloud. If you skipped the setup assistant, sign in to Settings > iCloud and enter the Apple ID you’d like to use with iCloud.
2. In Settings > iTunes and App Stores, sign in with the Apple ID you want to use for Store purchases (including iTunes in the Cloud and iTunes Match). You may need to sign out first to change the Apple ID.