I sign in my ipad by using my id, but when i want to update as show others people id

i try log out before, and sign in back but the same problem still happens

You can take the following steps, if you have ios 5 installed:
1. Go to settings,
2. Choose store,
3. Tap on Apple ID: (on the right pane)
4. Sign out
5. Tap on Sign In
6. Tap on Use Existing Apple ID in the modal dialog box
7. Enter username and password
8. Tap on OK and verify your payment info - Enter security code and then tap on Done
9. Go to Store (in setting) again
10. Turn on Apps

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