I don't think you can change it, you will need to send a ticket to the support team, which can be done by following the following link -
http://www.support.tm/
If you explain the situation to them they can get your email changed and get everything resent out to you. Just so you know they may take a few days to respond to you, if that happens don't submit another ticket otherwise you will push yourself further down the list, as they are resolved on a oldest to newest format.