Please refer to the following video on how to setup your X/M air series Mixer and X-Touch to be used on a dedicated network using the WLAN mode. 
WLAN is a Wireless Local Area Network, which allows you to link Multiple Wireless devices onto your network. 

This is extremely helpful for situations where a long cable run may be required (For example if your X/M-Air is on stage but your X-Touch is Front of house).