[Haskell-iPhone] new user

hi all I am a new user of the I phone 5 I did use the I phone 3gs but well never really got on all that well with it but well I do love the I phone 5, well that's enoth of that time for my first of many many questions!! I have been trying to get a new ring tone as I want something funny but I am getting no wear I tried to down load a few from I tunes they are on my phone if you go in to ring tones and then to store but I cant work out what to do from there. oh and I down loaded them from the pc I tunes and not the phone not sure if that makes any difference. well thanks for any help and I will try to keep my questions down as low as I can !! Joe