How do I add personal ringtones to iphone 4

YouTube demo:

http://www.youtube.com/watch?v=M7kN89mM11U

Purchase ringtones from the iTunes Music Store. Ringtones cost the same price as regular songs in the store's catalog and may be up to 30 seconds in length. Not all songs can be converted to ringtones, though you can find out which are eligible by looking for a small bell-shaped icon next to the title in the store's listings.
Or you can assign a specific ringtone to individual contacts in your iPhone. Choose a contact from your "Contacts" menu by tapping on it and then tap on "Ringtone" to see a list of available ringtones. The ringtone you tap on from the list will play every time that contact calls your phone.

Topons hope it can help you. Thank you！

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