Does Anyone know How to personalize text message ringtones on the LG...

...Dare?? personal ringers 4 text messages? Does Anyone know How to personalize text message ringtones on the LG Dare?? personal ringers 4 text messages?
I just got my LG Dare monday and im having trouble finding out how to set ringers to my text messages so that when a certain person texts me they have a personal ringer that i applied to their contact. i cannot figure out how & im getting frustrated because all i do is text and im sick of hearing the same text message ringer for every person and every text i get.