Kohler tub set problem

I'm new here. Hope someone can help.

I'm finishing up a remodel that the previous contractor really messed up and am having trouble getting a Kohler bath set to operate properly. The set includes a regular tub set and a hand held shower. The problem is that the shower will not operate although it is connected to the outlet at the faucets.

Any suggestions will be appreciated!

tub

What are you using for the diverter?