Raspberry Pi 3 wi-fi setup

Outernet software for Pi 3 needs wi-fi setup. Using LAN works. How do I set up wi-fi using rxOS only on the SD card?

Do you mean how do you connect to a local wifi network? The latest image has a setting under Network Interfaces in the dashboard.

https://archive.outernet.is/images/rxOS-Raspberry-Pi/2.0-201609232000/