Hey Guys - really appreciate the help so far. OK - It appears that my main PC is shareable over the network, but I can't get the other computers to see it at all. I'm very novice at this, so I really appreciate your help and patience...

I found the printer on the main computer and made it shareable following the directions in the link that Gresch (thanks!) provided, and I think my main computer is shared properly (but I'm not 100% sure - how do I check?). But when I go to one of the other computers and try to add a printer, I get an error message saying it can find it.

So what do I need to do next?