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I am tiling my tub and I need to remove a one handle shower knob that is very similar to this link. I can't figure out how to get the handle off. I also don't know how to attach a picture of the real handle which would probably help explain my problem. If anyone knows I would greatly appreciate the help. Thanks.

The handle in the picture has a allen wrench screw in the bottom side of the handle so get an allen wrench the size of the screw and unscrew it about three turns, the handle then should twist and slip off the shaft it is on. Make sure you have exactly the same size wrench because the screws will strip out if not sized right.

I don't understand what you mean that you can't attach a picture of the real handle. The instructions I gave you may not work on another handle that you have. Let me know if this info helped.

The picture looks like a moen positemp faucet with polished brass sleeve and pex water pipe. Pex uses black rings and pb used copper rings. Properly support your tub faucet before you close that wall.