There is no user manual for OSBee — the video on the product page:
https://opensprinkler.com/product/opensprinkler-bee/
basically serves as a manual. There hasn’t been any firmware update for OSBee so what the video shows is the only firmware that’s ever released. The only way to re-configure WiFi is to perform a factory reset — this is done by holding the pushbutton for more than 5 seconds, and the controller will reset to AP mode so that you can follow the WiFi setup steps to get it log on to a new WiFi.