C# namespace scripting issue (noob)

I’m trying to modify the demo ‘Room’ scene.

I have added a text mesh pro object and a new script to a ‘grabbable’.

problem: 

editing OVRGrabber to include TMPro

or, reference the new script parameters

both result in compilation errors mentioning the ‘namespace’ or assembly language problems

since I’m not messing around in assembly language, I assume this is a namespace issue that can be resolved using something like:

- using namespace something-I-can’t-figure-out

- or something akin to putting std:: in front of the offending call

appreciate the help, thanks