To create a post pay member tab firstly go to the Summary View on BarTab
Once you are in there press the Member Card button in the top left and you will be met with this screen.
Once on this screen press 'No Card' and you will get the following screen.
As you will see 'Post Pay?'is set to on. (if it is not on then turn it on)
Now type in the details like in the below image.
Once you have added the customers details press activate and you will see a confirmation screen like below.
Now Press 'OK' and you will now see the tab opened on the summary screen.