Joke Collection Website - Blessing messages - How to use information personalized ringtones on Apple's 4th generation mobile phones? I haven't thought of it for a long time. thank you

How to use information personalized ringtones on Apple's 4th generation mobile phones? I haven't thought of it for a long time. thank you

First, import MP3 music into iTunes, find it in it, click Advanced, create ACC or something, and you will see that there is another same music under your music. Click Display under windows, and you will find this music in your computer. Click Rename, change the format of M4A to M4R, then double-click, and iTunes will play it automatically. Then you plug in the iPhone and it will automatically synchronize.