I have an iphone 4s, and i have downloaded a ring tone?

From cellsea.com and it is in my music library and how do I convert it to my ring tone it is 25 seconds

It's a large process…
first make sure the tone 's in.m4r and not in mp3 format(usually these files are in mp3)
If it's mp3, convert it to m4r online ( for eg: https://www.google.co.in/...v.51773540, d.bmk )

aftr converting to m4r, sync the tone with itunes in your pc…

NOTE: It would appear under the "Tones" section and not the "Music " section

now connect your iphone and sync with itunes…

you'll find the tone in ringtones settings…

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