I'm going through the 124 and 134 courses again to study for the RHCSA exam.
I tried to start up a lab......lab permissions setup.... and it said to 'contact your instructor'.
How do I do that??
Well as you're the instructor, I guess that'd be you!
The most likely culprit is that you don't have your classroom system turned on. The lab command downloads the specific script (in this case permissions) from the classroom.example.com system. If this system is not available, the script can't be transferred, and the error message presented is to contact the instructor. (As the instructor would be the person that students would use to troubleshoot issues with the lab environment in the classroom.)