You can have your wife call in and do it (She's the account holder) or take it into the store, (she'll need to be with you/ have you added onto the account as an authorized user) whatever is easiest for you.
All they'll need is the serial number off the back of the phone, I think Verizon is MEID number or something like that.
EDIT: I don't know if you want a 2 year contract, but if you take your own equipment in you can avoid signing any contract at all. Just stress that when you call/ go in.