There is no separate valve to turn off the shower, except the mixing valve. If the shower leaks continuously after turning it off, then you need a new mixing valve. That is NOT a DIY project. Call a plumber. If you just need a new shower head, it is easy to replace yourself, but I would not try to fix it. Just buy a new one. When installing a new shower head, make sure not to overtighten it. Use the Teflon tape and tighten it by hand, and if it leaks a little, use a wrench and give it a one quarter turn.
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