TCP/IP Printer on DLINK N Router

What is the current state of the printer under Printer and Faxes on the Control Panel? If it's offline after you setup TCP/IP printing just right click on the printer icon then change the status from offline to online your printer should say ready below it and to test if it's already associated to the network try to run a "ping" test from your computer and check if you will get a reply from 192.168.0.4 which is the IP address of your printer as you mentioned. If your gettings time outs try to disable all the firewall and antivirus on your computer usually that will do the trick.