How can I customize the watch face and functions of the watch buttons?

The buttons do not work.

Below may be possible causes. Try the following remedies in sequence.

Functions are not assigned correctly to the buttons of the watch.Check it on the [Customization] screen of the dedicated app.
The Riiiver service is not provided in your current place.Riiiver is not available there.
Some networking error has occurred. Check the connection between the watch and the smartphone and that between the smartphone and the Internet.

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