Hello,
To control variables on LabVIEW UI, you have two options:
Deploying LabVIEW code with UI on myRIO and as long as IP address of myRIO is known, you can directly control it from LAN PC.
Second option is to control those variables using shared variables. This way, two VIs will be developed,one on myRIO and another one on PC. Again, the IP address must be configured to be able to access it on LAN