Installing ringtones on an iphone 4s

I must be mad or something. I bought a ringtone and its sitting in my 'purchased' folder. But when I try to click and drag into my iPhone or iTunes ringtones folders it simply does nothing.
I would be very grateful for someone to tell me what I'm doing wrong!
Thanks

deeddawg said:

Does it show up under Ringtones in itunes under the Library section?
Is itunes set to sync ringtones?

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No it doesn't appear under Ringtones. It only appears in Purchased. If I try to drag and drop from purchased into iTunes or iPhone nothing happens.
How do you check if iTunes is set to sync ringtones? I can't find any reference to ringtone syncing in any of the menus.
Thanks for responding.

kicko said:

i think when i bought one from itunes it was under purchased in the itunes app and then i selected it and it began to download. after it appeared under the sound settings of the phone. There was no sync involved. Other ones i have dragged into itunes myself require the syncing.

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That's my problem, it appears under purchases but doesn't move to the phone.
Also when I select my phone in iTunes its shows, Summary, apps, music etc but no tab for ringtones.
I think I'll just forget it. I'm spending hours messing around just to put a ringtone on the thing!