Go to the tax office, that's the big building across the road from Matisse.
Go in the left hand door (closed at 12-1 usually, for lunch)

Normally you get a ticket from the machine by the left hand desk but it hasn't worked for over a year.
Queue up at the booth on the other side of the room.
Go to the man on the left 1st, give him your Ruhsat.
He types details in, gives you the Ruhsat.
You then feed your way to the guy on the right.
He tells you how much to pay, cash only!
You pay, he gives you a receipt, you leave.
A little tip, the Turks always leave it until the last day of the month to pay, so to avoid the big queues, go before the last day and always best to go early morning - 9-9.30 if possible.
It's easy once you know
