If you look in your ArtRage menu under Tools, you should find 'Open a Reference image'
That will load the image that you can pin to the canvas. Also <ctrl>R will load it.
If that doesn't work, chances are your IT guy has installed the Free version of ArtRage instead of the Full version of ArtRage.
Check your Help, About ArtRage menu option.
If you've paid for a copy of ArtRage Full, you can re-download the installer from the ArtRage support webpage:
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"