German phrase
Ich möchte mich ummelden.
Meaning
I would like to change my registered address
When to use it
Used to change your address. It is polite and somewhat formal.
Example dialogue
Guten Tag, Ich möchte mich ummelden.
Hello, I would like to change my registered address.
Haben Sie Ihren Personalausweis und das ausgefüllte Formular dabei?
Do you have your identity card and the completed form with you?