just jumper pads 3 and 2 of the pot pads and leave pin 1. That would give you maximum output all the time, which might be too loud. You can also put a resistor instead of the jumper, but you'd have to experiment to find the right value for your taste.
I would suggest to put an internal trim pot instead, so you can adjust it to a level you like and set and forget. You'll have to bend the legs and maybe add a bit of wire to fit it.
