How do you disconnect a iPod?

If your iPid freezes like that, the best thing to do is to reset it. If you don't know how, look up on how to reset it. Remember the type and generation of your iPod. Different generations of iPods...

it is different on all computers but there is a button on the bottom right hand corner (all computers) that when you put your mouse over it. It says safely remove hard ware or something like that and...

You can either click the eject button by the iPod menu in iTunes, manually eject it from the computer by doing what your computer normally does to eject a flash drive, or you can just unplug it.

i wont do anything but eject the ipod first in future because it could wreck your ipod

Usually nothing, but all your music could be erased, so it's not worth the risk.