Green and yellow LED means the openSPOT2 is connected to the Wi-Fi network, and it's in standby with the Null connector active. You can see the LED states in the user manual:
http://manuals.sharkrf.com/openspot2/en/led-states.html
What you have to do is to open the web interface using sharkrf.link and use the Quick Setup to connect the openSPOT2 to a ham radio network.