@jasonjjd: Click the equip buttons below your current weapons after clicking the weapon you want to equip.
@RockNRollDemon: You have to die for the shop to come up.
Master Squid's tentcale should go behind the board, not in front of it. It's really annoying when they get a good one that I didn't notice because their tentacle was in the way.
Lots of late nights, with broken glasses. Sorry! heh