Yesterday when I installed the printer and followed the instructions from the Installation CD, at one point it told me the IP
address before it was necessary for me to use it. If you do not get an assigned IP
address, you can assign one like: 192.168.0.X where X can be any number that does not conflict with an already assigned number and which does not exceed the number of ports that your router allows. Do you know how to access your router information?
What kind of printer is it? Are you using a network cord going from the printer to the router? Has a port already been assigned to the printer that you do not know about? When it asks for a port, browse to see which ones have already been assigned. Did your printer come with an install CD? Do you have a users manual?
I had much trouble until I did a few of these but the important part of the install of the network printer is the assignment of a port on your router. That info is critical to setting up other computers on the network which will use that printer. Hope this helps. Do not give up, it will eventually work.