Hello csm099204, I can help with your request! Open the 'Contact' you want to assign the ringtone to. Select the 'Menu' key and then 'Options'. You should be able to choose the ringtone of your choice from the drop down menu next to 'Ringtone'. I hope this helps!
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This took me a little while to figure out as well. From the Lucid PDF manual (open the Play Music app first):
To use a song as a ringtone
You can set a song to be used as your phone ringtone in place of one of the ringtones that come with the phone.
** Touch and hold a song in a Library list. In the Context menu that opens, touch Use as ringtone.
** On the Playback screen, touch the Menu Key > More > Use as ringtone.
NOTE This adds the song to your ringtone list. Access the Contacts application to set it for a specific Contact entry