This forum is provided by EA but is designed as players helping players, so we cannot go into your game and fix it. You need to contact EA for that.
http://help.ea.com/en/contact-us/new/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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+++ This Forum is provided by EA but it is designed as Player helping/advising other Players - meaning we are not employed by EA +++
D'oh! - Em