If the printer is to connected your desktop and you want to share the printer then, you need to find the printer on the network from your laptop to install it.
On your laptop run the printer setup wizard for a network printer.Because your laptop is wireless should`nt be any different after you're connected to the router. The method to setup a printer on your laptop is exactly the same as the process to setup the printer on the desktop.
Of course thats Windows so i might have it wrong

---------- Post added at 12:05 ---------- Previous post was at 12:03 ----------
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Make sure the workgroups are the same for the PC's too
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Or of course,i might forget something important