i cannot turn my ipad off

Press and hold either volume button and the top button until the power off slider appears, then power off.

Learn more ⇢ Restart your iPad - Apple Support

If we didn’t answer your question, can you be more clear or elaborate? Is your iPad frozen or unresponsive?

-Zachyy ✌️

The easiest way to fully shut-down (turn-off) an iPad is from iPad settings:

Settings > General > Shut Down