If you are not sure which operating system you are using, click on the apple in the upper left of the Finder, and select About This Mac. The following screen will indicate your operating system version.

To add a new Dell printer to your Mac, go to the Apple in the upper right of your Finder and select System Preferences, then select Print & Fax. For this exercise, we'll be adding the ART printer, a standard Dell 5210n.

In the next screen, select the "+" sign under the list of installed printers in order to add another printer.

In the upper left, you should select "Default Browser" if it is not already selected by default, and you should see a list of available printers. Highlight the printer you want to install and wait a bit, as it will take a few moments for it to find the proper drivers. This could take upwards of one minute.

Once the Name and Print Using fields populate, press the Add button in the lower right, this screen should disappear and bring you back to the previous screen, where the printer should now appear, and be available for printing!