Donner DMK25 PRO midi remote script? -- beginner needs help setting up MIDI keyboard

There is a manual, but it doesn’t provide specific instructions on how to program the MIDI keyboard for Cubase LE. It even says on the transport button section that it needs to be mapped manually.

If no one can point to a user-script, then I guess I’ll settle for just figuring out how to map the transport buttons. Where in Cubase LE do I go to do that? When I go to edit the MIDI control surface in the Midi Remote panel, I don’t see the transport buttons as an option to map. I tried placing a button, then right clicking and going to the MIDI Remote mapping assistant, but even after assigning the appropriate function to the button and arranging it on the grid, it still remains orange. When I try to save and exit, it says the orange elements are not correctly programmed and will be erased. So what am I doing wrong?

I’m attaching screenshots of the manual, the MIDI Remote panel controller surface editor, and the MIDI remote mapping assistant (with the configuration for the button that is orange.)