I'm want to replace the O-rings in the diverter cause its dripping behind the wall when I turn it to tub spigut but not when I turn it shower but I can't seem to get the handle off I've taken the screw out and tapped on it to loosen it and I even pryed on it but no use any suggestions?

Hmm.. just answered a similar post texrebel34. Here you may need to go to local home supply store and purchase a HANDLE PULLER... costs about 15.00 dollars and is easy to use (locks behind handle and then you tighten tool handle to pull off).

That sounds to be best bet here.

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What brand of faucet is it?