To submit a grace period deletion, please follow these steps:
How do I submit a Grace Period Deletion Request? http://www.dynadot.com/help/question.html?aid=141
Please be aware that this is _not_ the same as marking a domain for deletion (http://www.dynadot.com/help/question.html?aid=51). If you choose to delete your domain this way, you will not receive any account credit.