Take your ash tray out ... Pull it out as normal, then push the little button in the middle on the bottom of the tray, then pull it out all together, then above the cigy lighter there should be a sliding panel, that will slide into the now open ash tray hole.
If you dont have this slidy panel, then it should be behind the blanking plates to the right of the heated window button.
You'll either have the larger oblong 16-Pin plug or you may have 2, 2 pin plugs, one white one black. That reader will work on either system, but you will need a 2x2 to 16-Pin converter if you have 2, 2 pin plugs, but the reader wil still work as normal.