It's usually taped back on itself and you have to have little fingers to have a good feel around for it and dexterity to undo the loom tape. Take out the switch panel to do it, PITA to clip the panel back in place though.
I'm in exactly same position, fitted the kit today - what a balls ache! But I'm missing those screws and even though my car has a powered soft top the wiring for the HRW switch isn't were it's meant to be - do I have to take the rear trim panel out to find it?