Hi,

>I want to add a printer that I don't have connected at the moment. I downloaded the software/driver from the HP site, but the printer is not in the list when trying to add through the control panel. How can I add this printer?

Varies a little depending on the OS (which you didn't specify. If the printer is not in the list you should be a 'Have disk' button or similar which allows you to browse to the relevant *.inf file.
HTH,
Viv