USB Wireless Modem for using Alhpa station

I bought 3 environment sensor and AWS gateway . For setup sensor and AWS gateway, I tried to access AWS gateway using wifi setup and entered the web interface.
But, Sensor device setup is very difficult as I tried to press CFG, Reset button servral times. sometimes displayed the device list, sometimes cannot displayed.

And then, I installed the alpha station, but cannot enter sensor setup, because there is no wireless modem.

Using Alpha station for sensor setup, should I buy wireless modem (802.15.4 to USB) ?
I cannot understand Network IP address of Alpha station connection setup. Is AWS gateway IP address or setup PC addresss ?

I hope soon help to me.

Thank you.

The USB modem will be ideal for initial testing in sensor configuration

While placing order mention this in special instruction " Configure to work with Sensor"