What other wireless devices are on your network? IE what brand and model number?
Did you change the factory settings on your wireless router, or leave it as it came? This will help the people here asnwer your "what is a valid ip address?" question.
What do you mean by "it still doesn't work."? Are you getting a printer communication error, or is nothing happening?
Was the printer at one point connected to the computer that you are trying to print wirelessly from?
Have you installed the printer on the computer that you are trying to print wirelessly from as a network printer?