Yes, if you have funds remaining on your gift card you may use them towards a tip. You will receive a slip similar to a credit card where you can write the tip amount in.
Please click on the "forgot password" link on the login page of online ordering. You can have your password emailed to you or you can view instantly by answering the security questions.
Domino's offer the revolutionary Domino's Tracker® system, which allows you to track your pizza order from the time you order it until it hits your doorstep.