Where you thrown back into an Anonymous game? You need to log in. Login buttons: Welcomescreen, bottom left. Friendscreen (minitowns) tap Bart/Milhouse, bottom right in the pop-up "add origin friends" enter log in info.
Either exit the game to access the Welcomescreen or play through the first levels to access the Bart/Milhouse button to take you to the Friendscreen with the minitown.
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D'oh! - Em