OR are you confusing the alarm button for a boot release? The 2 switches on the drivers door B pillar are FUEL FLAP OPEN and ALARM INTERIOR MONITORING DISABLE.
The hatch has a soft touch button on the hatch just below the Audi rings and above the number plate. Is opened ( unlatched ) by pressing and holding the centre button on the remote for a couple of seconds and has the emergency release cable built into the hatch trim panel.
Suggest if you do not have one that you obtain a copy of the owners manual as all this is fully explained in it and answers most questions.