Ⅰ. Teach you how to switch song format by iTunes.
1. Enter iTunes;
2. Click “Edit” and then click “Preferred settings”;
3. Click “Advanced” and then “Import” button (for latest version, just click the import setting on “General” tab)
4. At last fill relevant values and click OK.
5. Right click the song you would like to switch, and click “The selected content is of AAC”.
Ⅱ. Teach you how to write song information, lyrics and album pictures.
1. Enter iTunes.
2. Right click the selected song, and click “Display introduction”.
3. Change value and click OK, now it’s done!