Green/yellow LED means the openSPOT2 is connected to the configured Wi-Fi network and it is standing by (the Null connector is active).
http://manuals.sharkrf.com/openspot2/en/led-states.html#page-top
What you have to do is to connect your browser device (phone/tablet/computer) to the exact same Wi-Fi network as you've configured for the openSPOT2 and use sharkrf.link to open it's web interface. If sharkrf.link does not work, then make sure Wi-Fi client isolation is turned off in your Wi-Fi router's settings.
After opening the web interface you can use the Quick Setup to setup a connection to a server.