Just follow these easy steps:
1. Buy phone card from local store.
2. Open it off and scratch off some silver stuff to reveal your code number.
3. Go here:
http://www.tracfone.com to add minutes (you can also buy the minutes on that site instead of going to the store)
4. Type in numbers from the scratch off thingy.
5. Put code numbers it gives you into phone...oh wait...since Shari would have the phone, she'd probably do this. But, you can still buy the card for her and scratch it off and tell her what the numbers are to put in.