CUPS is a network printing service used on Mac computers, and allows you to setup your printers on a network, and customise options such as the page settings, cash drawer setup, etc.

1. Go to http://localhost:631/printers/

A screen will appear saying 'Web Interface is Disabled'

To enable CUPS:

1. Select and copy the following text: "cupsctl WebInterface=yes"

2. Next, click on the magnifying glass in the top right hand corner of your screen and search for "Terminal".

3. Once in the terminal programme, paste teh following text into it: "cupsctl WebInterface=yes" and click enter.

Now you should be able to go to http://localhost:631/printers/ and find/view your installed printers.

To change settings for your printer, or to set up your cash drawer for example, click the desired printer, and modify the options provided.