This is a specialist job and needs to be handeled by one, Sometimes the head needs to come off. Take it to a garage.
If the screw is stripped then the threads are not holding and can be removed with pliers. If your asking, about the head being stripped, then you take a hack saw blade and cut a new slot in it,this way you can use a slotted screw driver to remove it. If it is locked in and does not come out, you will have to drill it out with a drill bit that is smaller then the thread size.
the diverter knob is either stripped or the diverter itself itself may be broken turn the water supply off take the knob off a carefully remove the diverter shaft if the flapper is missing look inside the housing for the broken piece then take the name and model down to home depot or similar home store and someone will be able to match it up,. but my money is on the stripped knob
The best way is to have it stripped out. Having it stripped out requires getting a bleach/cleansing bath. This is where they put bleach on the hair and rub it to remove the colour. It can cause a little damage and take a long time if the dye you put in is dark. Go to your salon and talk to them about it.
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