Apple ID for adownloading Apps

[petnor]

When I want to download an app my iPad2 defaults to my sister's Apple ID instead of mine. How do I change it back so that I can enter my password and download an app?

 

[Kaykaykay]

Open iTunes app, click on Music tab, scroll to lower left, tap on your sister's Apple ID, sign out, then sign in under your account.

You can sign out and in via the app store app, too.