trouble adding a wireless hp printer to airport express

I have a new HP photosmart 6510. Previously I had a 5510 that I could not get to work wirelessly. So I ended up trying the 6510. I finally ---- after hours!!!! ---- figured out how to get the printer to work wirelessly. I had to input the default gateway into the manual settings on the printer.

I have another HP 8500 that gave me the information. Otherwise I do not know how I would have gotten the numbers to input.

Many people have had this same issue of not being able to connect HP printers to the apple airport express base stations that are password protected. The technicians tried many, many, many things, but none of them had me to input the gateway information manually.

I sure hope this helps someone else.