Create ringtones for I-Phone 5

I have been told 'Myxer' and 'Ventones' are really easy and useful (and free!) to create ringtone for the I-Phone from your own I-Tunes library? I have tried 'Myxer' and for the life of me, I can access the ringtone I appear to have created via "Apps" on the device screen but cannot get it into my ringtones folder ? Has anyone experienced a similar problem and overcome it? Is Ventones any better/easier? Regards Tony