Cups stands for 'Common Unix Printing System'. In short, this software provides what most printers need to print. It is the recommended 'printing system' common to most linux and unix systems. It allows the management of printing.
Distro, it a short form of distribution. ie Ubuntu is a distro, as is Red Hat. I asked what distro ( distribution ) just so I had some idea if there is a package manager you can use to install Cups.
The URL I provided will not work until you install Cups. Once Cups is installed, and running, port 631 will be opened on your TCP/IP stack. That will allow you to connect to Cups, install your printer, manage it etc.
Here is a link that will work now. http://www.cups.org/doc-1.1/sam.html#MANAGING_PRINTERS
It is the documentation for Cups. I'm not suggesting you read it, it will probably give you information overload. It is a reference, if and when you need more information on Cups.
Hope this helps.