Hello Stephanie,
Sorry for late reply to this,
Actually the Komento only have few content through in email example : confirmation subscription, new comment, moderate comment, report comment email and etc (
http://screencast.com/t/UbhWaVlVD4IK ). For the registration email content is under Joomla side, I'm not sure my suggestion is helpful or not, you can check it the file from
JoomlaFolder\language\en-GB\en-GB.com_users.ini, and you try to find which email content is before you getting, when you confirm the email content is come from that code line, then edit it. (Notice : Remember back up the file when you edit)
Hope this help.