First, you must have money on your Wolfcard for printing (add $ on UNR's Wolfcard site or using the machines on Floor 2 and in @One in the Knowledge Center.).
Just send a print job from the application you're using, then go to one of the printers on the same floor, slide your WolfCard and use the touch screen to find your print job (listed by your netID name) and print the job.
Here is a link to printing instructions:
For help, visit the Library & Research Services Desk (2nd floor) or call 682-5657.