Как я могу воспользоваться этими услугами?

You need to make sure that you have an international transfer flight through İstanbul with Turkish Airlines. Your layover must be at least 6 hours at most 24 hours. You can just proceed to Touristanbul Desk in the International Arrival Hall at Istanbul Airport or to the Touristanbul Desk at the transfer desk area just half an hour before the tour start.