Please register - Düsseldorf´s authorities
The trip to the Einwohnermeldeamt (Residents Registration Office) should be one of the first things you do because according to North Rhine-Westphalia’s registration law you are obliged to register in your new district within a week after moving.
Penalties may apply if you leave it longer. Furthermore, you only feel like a genuine Düsseldorf resident when it’s official, don’t you?