I don’t know your printer and the software varies from manufacturer to manufacturer, but ordinarily the first computer is connected to the printer via a USB cable and the software is installed. Follow the screen prompts to set up the wireless connection for the first time. Once it has been set up you can remove the USB cable.
The USB cable is not required on second and subsequent computers, simply install the software and follow the screen prompts for an additional computer (or similar wording). You may have to key in the SSID and Wireless Key, after which the printer should be recognised.