1? Download music to your computer, it goes without saying how to download it, whether it's Thunderbolt, saving the target as or qq music.

2? Open itunes, click "File" in the upper left corner, select "Add File to Library", and a window will pop up, where you can select your downloaded music (that is, the music you want to import into your iphone) and click "OK".

3? Now in the "Music" in the upper left corner, the music file you added appears.

4? Connect the iphone to the computer. On the left column of itune, "XXX's iphone" will be displayed. Click it, and the information of your iphone will appear on the main screen. Pull down the scroll bar on the right side, and there is an option "Manage music and videos manually" in the middle of the screen. Check that option (if it is already checked, it is not needed).

5? Click the "Music" in the upper left corner (that is, the "Music" in step 3), and the music you want to put into the iphone will be displayed on the screen. Click the song with the left button and drag it directly to the top of "xxx's iphone" (which coincides with the words "XXX's iphone"), and then release the left button to start downloading to the iphone. There will be a progress display right above.

6? Give me some points, brother. I wrote so hard that I played with my hands.