How to change to PCM keyboard

[proplayer44]

So I'm trying my darndest to get this stupid PCM keyboard to work. I've installed it and soft reset and when I go to input devices in settings and try to change to it in the drop down it doesn't work. When I go back to input devices its set back to full Querty. I believe I read here somewhere you need TF3D turned off to do it which I did before installing but still no go.

When I do change the input to PocketCM keyboard and immediately click on options I get the error "PocketCM keyboard has to be the current SIP in order to configure it."

Do you know what I'm doing wrong?