The phone is your wi-fi hotspot. It will display an SSID. The camera needs to connect to the phone using Wi-Fi client mode.
This is a setting of the camera, not the plug-in.
Read the article below for client mode configuration.
As the mobile phone technique is more complex, I suggest you progress this way:
- get client mode working with RICOH THETA official mode app
- get Wireless Streaming plug-in working
- finally, try Wireless Streaming plug-in working with your mobile phone
There’s a bunch of steps, but it gets easier with experience with the camera.