Now what?

Ok last week I posted buying a used car, thanks to handsomeman I learned about metrash2 it was easy thank you, he directed me to go police dept to get my reg card, I went to the nearest police dept in Al Sadd but when I got to ask guy on the window told me they dont do car reg transfer. So what police dept can I go to near Al Sadd?
Thanks for the reply i will try the traffic dept first
That is possible at the Airport office also ............
You need to go to Traffic Department in Madinat Khalifa near Burger King Intersection.