Easiest way ..
1. Get the printers wireless MAC address, normally a sticker somewhere.
2. On router, reserve a static IP against the MAC, so printer always has the same network address.
3. Switch on printer, Select the wireless connection setup option
4. Select Yes, send my wireless settings to the printer , and then click Next.
5. Follow the on-screen instructions to complete the software installation and wireless network setup for the printer.