Welcome to the forum!
I have not been able to find an owner's manual for that unit online. Do you have a link to one?
I was looking for the manual to help you step through the process, but here's the general approach. Follow the steps within the manual to switch back to NTSC (or to reset the factory setting). Don't rely on seeing the steps on the screen, because you can't. Just follow the steps one at a time and press the appropriate buttons on the remote. You will know at the end if you pushed them correctly because the unit should be reset to NTSC.
If you can give me a link to the manual, then I can help you step through it.
Adam