I think the original poster was talking about the print server built into the SMC Barricade. If that's the case, the way to do this is as follows:
0. Before you do anything, go to the computer that was using the broadband connection directly and get the information on the gateway IP address, DNS server IP addresses, and MAC/physical address (the 12 digit number separated by colons) from "ipconfig" (accessible through the Run...and then show the details). Write it down before you start anything.
1. Plug the cable/dsl modem into the WAN side of the SMC using the supplied cable.
2. Plug the computers into the front of the SMC.
3. Attach the printer to the parallel port at the back of the Barricade. If it's USB only, you're SOL.
3. Power up the router and printer. Start up the computers, making sure they're set up for DHCP (i.e. obtain an IP address automatically).
4. Start Internet Explorer and go into 192.168.2.1 (the SMC Barricade's web server). Just click on the button without a password.
5. Go through the setup procedure that it will walk you through, and fill out the information on there. Note: if you don't put in the MAC address, some broadband server equipment won't like new network devices and may not connect immediately. If you're not sure about a setting, just leave it at default and proceed. Once you reach the end, log out of the server (lower left corner of the web page, may need to scroll down).
6. Verify that you have an internet connection by browsing the web. You can do pretty much anything you want except for receiving Microsoft NetMeeting calls (that's an entire other story...).
7. Take the SMC Barricade CD and install the printer driver on each computer. If you haven't done so already, install the driver for your particular model of printer. You'll probably need to restart the computers if you haven't done so already.
8. Go to the printer configuration for the printer and make sure the port points to SMC100 Barricade. Also, make sure that the printer is set to UNIDIRECTIONAL mode (i.e. disable bidirectional), and make sure that "start print after last page is spooled" is selected.
9. Try to print a document.
Now, this is what is SUPPOSED to work, but who knows what you'll get. This is just a consolidation of the quick reference card you should've received with your SMC Barricade. If your printer requires bidirect support, you're SOL. Sorry...
QUESTION FOR NETWORK GURUS: Do printers set up with Windows Networking but that are behind the router/firewall have the ability to be detected or accessed from outside the router/firewall?