Providing you are running a Windows PC then the following should apply.
Text taken from Windows XP help and Support.
To share your printer
Open Printers and Faxes.
Right-click the printer you want to share, and then click Sharing.
The options you see on the Sharing tab differ depending on whether sharing is enabled on your computer. For instructions on what to do next, click the option that describes what you see on the Sharing tab.
I see text stating that printer sharing must be turned on
You need to enable printer sharing by running the Network Setup Wizard. Start it by clicking the link on the Sharing tab, and then follow the instructions. Once sharing is enabled, begin this procedure again.
I see options for sharing or not sharing the printer
On the Sharing tab, click Share this printer, and then, in the Share name box, type a name for the shared printer.
If you share the printer with users on different hardware or different operating systems, click Additional Drivers. Click the environment and operating system for the other computers, and then click OK to install the additional drivers.
Drivers for users running other versions of Windows (Windows 95, Windows 98, or Windows NT 4.0) are located on the Support CD. Printer drivers for Windows NT 3.1 and Windows NT 3.5 are not included.
Click OK, or, if you have installed additional drivers, click Close.
If you have followed the steps listed above and still cannot share this printer, open Windows Firewall. (To open Windows Firewall, click Start, click Control Panel, and then double-click Windows Firewall.) Then, on the Exceptions tab, select the File and Printer Sharing check box.