How to Set Up Behringer X-Air XR18 Wifi Client

A quick one for my band mates mainly... How to connect a Behringer X-Air XR18 mixer to a home wifi network (Wifi Client Mode). Whether this will work for everyone, I have no idea; it will no doubt depend on your home network (and security) settings, but this works reliably for me and is offered as a starting point as there seems to be little else available.