You can configure CUPS from a browser by adding "http://localhost:631" (without quotes) in the URL bar of the browser. That will access the CUPS configuration application.
However, by default, and for security reasons, root will be unable to connect to a non-root user's X server, and you wont be able to access the CUPS printer configuration unless you give the root user permission to do so. You do that in the following manner:
As user, open a terminal and enter this command: xhost + localhost
Now the root user can run a graphical application such as a browser within the users environment.
Now, using the firefox browser as an example, if you use the kde environment, run the command: kdesu firefox
to run firefox as root.
Or, if you use the gnome desktop, run the command: gksu firefox.
Once firefox is open, enter http://localhost:631
in the url bar.
In the resulting page, click on Manage Printers. The page that comes up should list your printer. You can then edit the configuration by clicking on the Edit button and go through the prompts to configure it to your liking.
When done, exit the browser.
Once you have made a change to a configuration file you need to restart the CUPS server by sending it a HUP signal or using the supplied initialization script. The CUPS distributions install the script in the init.d directory with the name cups. The location varies based upon the operating system, but Mint probably uses the same location as it's ancestor distro Debian.
That will make your changes take effect immediately.
Now, back in the terminal, as user, enter xhost - localhost to reverse the command given earlier.
For more in-depth information, read the CUPS documentation.