Hey MegMeg,
Date changes penalties can vary in price depending on the rules of the ticket, starting at $25.00. It should be printed on itinerary if it is an E-tkt, or on the ticket itself (it it is a blue student ticket.)

Also, your student ticket will be changeable for a penalty, plus fare differance. There is not always a fare difference, but you will be responsible for the cost (which also varies per ticket/date/day of the week etc)

If you bought your ticket in a branch, you can call your helpful travel advisor to see if the ticket is allowed to be changed and how much the total will be with penalty and fare differeance.

If you bought it online, send me an email with your folder number and i will see what i can do to help you out!

Cheers!
Farah
hvn@statravel.com