Just unscrew the large slotted screw (you may need a screwdriver to start it) at the right rear of the receiver, then you can separate the two halves of the receiver to access the internal parts.
Once you get inside you can kind of see how it all works by sliding the forend back and forth. The bolt is easily removed and replaced, and I wouldn't recommend further
disassembly unless you have a problem. Also, make sure you only use standard velocity in it.
Good luck with it.