You can either login to a computer in the computer lab with your University of Minnesota account (the part before the @ of your umn.edu email address) and print to the black and white and color laser printers.
You can download and install a printer driver to your laptop and print anywhere you are connected to the Internet.
You will need to have money on your Gopher Gold account (on your UCard) in order to release your print from the two stations in the computer lab. You can add money with a credit card (and a $2 fee) at the Gopher Gold website. Or, you can walk to Walter Library and use the machine on the second floor to add cash to your card without the $2 fee.