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You must register at the town hall where you live (Anmeldebescheinigung /Einwohnermeldeamt) :
You must go to the town hall and ask for a registry form. Go with your passport and your tenant contract. The price is about 5€ and it is mandatory.
Depending on the land, this registration must occur within 7 or 14 days after you arrive.

The German Post :

die Deutche Post
http://www.deutschepost.de

Customer services : 01802 33 (Mon-Fri 7h00-20h00, Sat 8h00-14h00)

Carry out your change of address at the Post.