I'm unable tu burn mp3 Cd from with songs downloaded from iTunes store, it says that they aren't in mp3 format!
how can I do?
How can I convert them?
iTunes can only burn an MP3 CD from songs that are already in MP3 format.
If you have songs in other formats, you can use iTunes to convert them to MP3 by this guide:
iTunes: How to convert a song to a different file format
Note that the conversion process creates a new MP3 and leaves the original in place. When you are ready to burn your MP3 CD, make sure you are using the newly created MP3s, not the original tracks.
iTunes 10 for Mac: Create your own MP3 CDs - http://support.apple.com/kb/PH1748
iTunes: How to set the play order of songs on an MP3 CD - http://support.apple.com/kb/HT2455