I would really appreciate all the help I can get.
I'm trying to close the water supply valve to the toilet, but it is stuck. The valve doesn't have a handle, but instead it looks like it uses a screwdriver (maybe?). I tried turning it both ways with a screwdriver, but it isn't turning at all. Here are some pictures, if you were wondering:
I live in an apartment, so I don't have access to the main water supply valve either. I'm a total newbie, so any help would be appreciated. Thanks.