Almost the same as installing any other printer.
To begin go Start\Run and type \\servername Double click the fax you wish to install and follow the usual prompts. If the wizard does not recognize the printer\fax you will need to use the installation disc that came with it.
The first time you connect to a shared fax printer you will be asked if you want to install the Shared Fax Client. This will install shotcuts on the Start menu for sending faxes, and will also make it possible to monitor faxes as they are sent.