Pjgoode, you'll need to identify the MAC address of your printer's wireless adaptor (something that looks like 00-1B-3F-20-44-6E) and add that address to the configuration of your wireless router, usually under a Firewall menu.  This means that your printer will now be visible as a network device and (provided you have the suitable printer driver) you'll be able to connect to it just like you do a printer on an ethernet cable.