The race is finished
Carefully make your way off the drivers stand, and turn off your car and transmitter. The next part is key... do not leave the race arena. Place your car & transmitter on the scrutineering table, then turn back to the track and marshall. There should not be any reason for you to leave the race arena unless you have a marshalling substitute.
While you marshall, your car may get inspected to ensure it complies with the class rules. It will get weighed, and motor, tyres inspected if it's spec class.