Customizing checkout with more text fields

Can we customized MarketPress with the additional fields that are currently on our other shopping cart for this client: http://lakekountry.com/cart2.php

First Name:
Last Name:
Address:
City:
State:
Zip:
Telephone: (If we have questions with your order.)
Telephone: (Customer receiving the flowers.)
Message on enclosure card:

Thank you!

Julie