Assuming you would like a step by step guide on how to download MP3 files as ringtones for your iPhone: 1. On your computer, find the MP3 file that you want to use as a ringtone. 2. Right-click (or Control-click) the MP3 file and choose Get Info. 3. In the Get Info window, click the Options tab. 4. In the Options tab, under Start Time and Stop Time, enter the beginning and ending times for the portion of the song that you want to use as your ringtone. For example, if you want to use the first 30 seconds of the song, enter 0:00 as the Start Time and 0:30 as the Stop Time. 5. Close the Get Info window. 6. Select the portion of the song that you want to use as your ringtone by pressing Command-A (Mac) or Control-A (Windows). 7. Copy the selected portion of the song by pressing Command-C (Mac) or Control-C (Windows). 8. Open the iTunes Preferences window by choosing iTunes > Preferences (Mac) or Edit > Preferences (Windows). 9. Click the General tab. 10. Click the Import Settings button. 11. In the Import Settings window, make sure the setting for Import Using is MP3 Encoder. 12. Click OK to close the Import Settings window. 13. Go to the iTunes Library and create a new playlist. Name the playlist whatever you want. 14. Drag the MP3 file that you want to use as a ringtone into the playlist. 15. In the iTunes Library, select the song that you just added to the playlist. 16. Choose File > Get Info. 17. In the Get Info window, click the Options tab. 18. In the Options tab, under Start Time and Stop Time, enter the beginning and ending times for the portion of the song that you want to use as your ringtone. For example, if you want to use the first 30 seconds of the song, enter 0:00 as the Start Time and 0:30 as the Stop Time. 19. Close the Get Info window. 20. Select the portion of the song that you want to use as your ringtone by pressing Command-A (Mac) or Control-A (Windows).