Welcome @galwaygirl, There are a few discussions on the Medtronic spinal cord stimulators that might be helpful.

-- Has anyone tried the HF10 Spinal Cord Stimulation Device?:
https://connect.mayoclinic.org/discussion/hf-10-spinal-cord-stimulation-device-relieves-back-and-leg-pain/
-- Spinal cord stimulation: Will Nevro help when Medtronic didn't?:
https://connect.mayoclinic.org/discussion/nevro/

Sorry to hear the Medtronic rep left the device for you to setup. The manufacturer's website might have some helpful information on the setup and use.
-- https://www.medtronic.com/us-en/healthcare-professionals/products/neurological/spinal-cord-stimulation-systems/intellis-platform.html

Have you seen this YouTube video on the stimulator use and setup? https://youtu.be/Xr-lEtiRy4o