Speak to Milo, another prisoner in the room, so you can swap uniforms with him. Crouch down and pick it up to throw it in the machine, then try to use it again. Follow the instructions on your machine by moving until a metal piece falls off. Put your arm in the machine in the room you're shoved into, then walk into the next and operate a machine as a fellow inmate gives you a tip on finding Set Roth.
