Hi @Roona,
Does the form require you to provide a specific address? On such forms to request a move you usually just write the name of the place you wish to move to, not an actual specific street address. For example ‘Hamburg’ or ‘Berlin’. Or if it in a more regional area it may be called something like ‘Landkreis X’.
Here is an example of such a form, where it would be sufficient to write for example ‘Hiermit beantrage ich die Änderung der Wohnsitzauflage, da ich beansichtige nach BERLIN umzuziehen’.
https://***.fluechtlingsrat-lsa.de/wp-content/uploads/2017/01/Wohnsitzauflage.pdf
I hope that clarifies it. If not, let us know.
Best,
Éanna