You can turn on Wifi on the watch menu, Setting - Wi-Fi.
Then go to Ojoy watch App, Function - Watch Wi-Fi, and click Add to input Wi-Fi name and password.
The watch only supports 2.4G Wi-Fi, and doesn't support 5G Wi-Fi.
I cant even fit the name of the router for it to connect to the wifi.
I am facing same issue. Watch even not connecting to 2.4 G wi-fi