HOw to change user name on ipod touch because i set it up on someone Else's computer?

I set up my second generation ipod touch on my brothers computer with his itunes account. Now, i am not able to buy apps without his password. How can i fix this problem?HOw to change user name on ipod touch because i set it up on someone Else%26039;s computer?
I had this same problem, so I went to:



http://support.apple.com/kb/HT1311



Summary:

%26quot;It is not possible to change the account in use on the device itself or to sync multiple accounts to your mobile device. To change the account you are using on your mobile device, go to your computer and sign in to the iTunes Store with the account you want to use on your mobile device, then sync your iPhone or iPod touch with your computer again. This will transfer the new account information to the mobile device. To sign in or out of an account in iTunes choose Store %26gt; Sign In (or Sign Out).%26quot;

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