Did you continue with step 7 to 13?
13. Quit UC Surface (close the device window) and power cycle the RM mixer, removing the wired connection between the router and the RM mixer.
Now, every time you turn on your StudioLive RM-series mixer, it will:
A. Look for a wired Ethernet connection and use it if one is found.
B. If no wired connection is found, it will check whether the USB Wi-Fi LAN adapter is plugged in.
C. If the Wi-Fi LAN adapter is found, the mixer will look for, and attempt to connect to, the wireless network it has been configured to use.