Hi everyone , I actually solve this problem by myself after I start this discuesstion. And I keep getting email from people having the same problem. Hope this will help 😝
This is how I add music to my i-phone.
1. You attach your Iphone to your PC, and start I-tunes.
2. On the upper right, there is an "Iphone" icon. Click on it.
3. Then click on "On this I-phone" tab. The tab list is on the top of your itune software. It should be the one on the right side.
4. Then you can see there is a "Music" tab on the left side.
5. Make sure the music you download is converted into the right version. as "mp3" or movie clip as "mov"
6. Go ahead drag your music into it. 😁
Apple stuff is always unique and I like it cause they look so clean and beautiful. But there are just too many small problems need to deal with.