Remove the forend screw and forend as MSP said to remove the barrel, complete frame disassembly, except the hinge pin, can be found in the trigger hone info in the FAQs and Help sticky, it's not a good idea to remove the hinge pin itself unless you index it so it can be reinstalled in the same orientation as originally installed or the barrel may not fit when you put it back together. ALL frame pins are removed right to left, they're spined on the left side.
Tim