Shower head?

How does one masturbate with a shower head??? Do you let the water hit your clit? Or run into your vagina? Or do you use the actual shower head to somehow rub your vagina? I am so very confused. I tried to use the bath one time and I angled myself to where my vagina was under the running water, but it just did not feel good and I didn't even get close to pleasure, let alone an orgasm... How do I do this??