Adjusting the handbrake at the dealership costs time, so does anyone know how i can adjust it myself?

Under the rear cup holder you will see the linkage and a 10mm nut.

Tighten the nut to adjust the lever tighter.

If you are on disc brakes - have a look at the little lever on the caliper - it should be about 1mm off the stop when correctly adjusted.
 
Under the rear cup holder you will see the linkage and a 10mm nut.

Tighten the nut to adjust the lever tighter.

If you are on disc brakes - have a look at the little lever on the caliper - it should be about 1mm off the stop when correctly adjusted.

I am on drum brakes so it should be under the rear cup holder?