I have the WIFI Ranger, also. The switch at the location you describe sounds like the WIFI on/off switch. The WIFI ranger is just an "amplifier" for any WIFI signal that may be around when camping. When you turn on the WIFI Ranger, it should show as a WIFI connection option on your phone, but you will need to enter the password to access it, but without a real WIFI signal you will get nothing.
2014 Elevation 3616 5er
2015 F350 6.7L Diesel 4X4 - long bed, dually