Ringtones purchased on iPhone via iTunes app do not show up in settings

Question

I bought ringtones via the iTunes app on my iPhone instead of buying ringtones through my PC.
But the 100 ringtones from a collection I bought do not show up in my settings for sound, or are listed in Contacts for assigning a ringtone to individuals.
I wanted to emphasize these are NOT custom ringtones, these are legitimate ring tones purchased from iTunes.
How can I assign the purchased ringtones to contacts and as the default ringtone when they are not listed?
On a related note, how can I delete some of the standard ringtones?

Answer 1

How to create custom ringtones ...
1. Open iTunes.
2. Find the song that you want to make into a ringtone.
3. Listen to the song and find the part of it you want to use. The chorus may be a good place to start.
4. Write down the start and stop times of the clip.
5. Right-click the song and select "Get Info."
6. Click the "Options" tab.
7. Type in the start time of your ringtone in the text box next to "Start Time" in the minutes:seconds (i.e., 2:01) format.
8. Type in the end time of your ringtone in the text box next to "Stop Time." Make sure the ringtone is no more than 30 seconds long.
9. Click "OK."
10. Right-click your song again and select "Convert Selection to AAC." Wait for iTunes to convert your song. It will create a duplicate version.
11. Right-click the ringtone and select "Delete."
12. Click on the "Keep Files" button.
13. Find the file. It's usually in your User folder under "Music > iTunes > iTunes Music" and under the band's name. It will have an extension of m4a.
14. Replace the m4a extension of your ringtone with m4r. You can either double-click slowly to rename your file, or right-click and select "Get Info" on a Mac or "Rename" on a Windows PC.
15. Click "Use .m4r" or the PC equivalent when the system warns you that the change may affect the use of your file.
16. Double-click the ringtone file. ITunes will automatically add it to your ringtones folder in your iTunes Music Library.
17. Connect your iPhone and sync your ringtones.
Oh, also to change a file extension. (not sure on Mac), but in Windows you need to go to "control panel" select "folder options". You need to uncheck the box "hide file extension for known file types". This will allow you to view and change the files extensions.
Hope this is useful ...