1. The music player on the iPhone needs to add songs before it can be used to play music.

2. You can synchronize songs to your mobile phone through your computer, and then you can find them in the mobile music application and click to play them.

3. To synchronize songs to your mobile phone, you can use iTunes or Apple Software Assistant to download and install the software on your computer, and then log in with your mobile phone ID account.

4. Connect the synchronization assistant on your mobile phone and computer, load the songs into the synchronization software, and click Apply to synchronize.

5. After synchronization is completed, you can find it in the mobile music program and click to play.