ringtone on my iphone

I put a free ringtone on my iphone, but I do not find the solution, I saw on the Internet should be a piece of cake,it would be done in less than 30 seconds I just need to convert to m4a.
I am a little lost, someone could give me an explanation on how to proceed please?

have you tried ibrickr

you need to get a software like iPhoneRingToneMaker
it will cost you .

Just download iringer for free and then you can convert any MP3 to ringtones

check this site out! may this will help you http://macmost.com/iphoneringtones/

thanks for the reply guys

Great!
I ever wanted to create iTunes songs as our unique iPhone ringtone, but I can not know how to do.
A friend recommend me a best iPhone ringtone maker, which really let me create ringtone for iPhone from almost all popular video and audio. Moreover, it can create iPhone ringtone from iTunes protected songs.
Very supernatural!