Wireless Network Works, Printer Adds to Network, Won't Print

My laptop is connected to my desktop with a wireless card. I can access files
on the desktop and the internet. The printer connected to the desktop is also
added to the laptop and shows as shared The port assigned on the laptop
shared printer is the port on the desktop, instead of the wireless port. The
window to change the port setting will not allow me to change the port! So,
everytime I try to print to the shared printer from the remote laptop, the
signal is not sent to the wireless port and then to the printer, but to the
USB port on the laptop! Any ideas how to fix this problem? I have spent hours
trying to fix this to no avail. Thanks for whatever ideas you can offer.