If you are still at LAF, you need to apply for your rent to be covered at the “EJF” in the Turmstrasse Haus M. For that you need:
• The lease offer (the official form from the landlord)
• Your ID/resident permit
• And the permission to look for an apartment.
At jobcenter, you can easily come by with your ID and your lease offer and then directly apply for your rent to be covered. Normally you will get it at the same day