1. Open Xiao Tiancai's mobile phone watch and make sure it is connected to the network.
2. On the watch screen, find the "More" option, and then click Enter.
3. In the More option, find the Music option, and then click Enter.
4. In the music options, you can find the "Songs" option, and click it to add local songs to your watch. If you want to send online songs, you can also find the "online music library" or "search songs" option in the music options, enter the song name and download it to your watch.
5. After adding or downloading songs, you can find the address book or group chat option. After entering, select the friends who want to send songs, click the "+"button in the chat interface, and then select the "Music" option to select and send the desired songs.
I hope the above information can help you solve the problem. Please feel free to let me know if you have any other questions.