Istanbul - the subway

The subway that I take to work is easy to figure out but credit cards and receipts are not part of the process.  The machines take coins (green) or bills (orange). Have 5's and 10's ready.
A yellow token pops out and your change into the change area below. You can buy more than one token at a time.

 The token goes into the slot to the left of the green arrow and in you go.  You don't need an exit token. I'd still like to get a card but those seem to only be sold in one place and the line is long.