You can change your contact e-mail address by contacting support@lunarpages.com and requested to update your billing and contact information.

It is highly recommended to have a contact e-mail address which is not at your domain(s) hosted at LP.  After all if you have an issue with your account, and Lunar Pages needs to contact you, it may not work if they are posting to your account on Lunar Pages.  At worst, set up a free e-mail address, altavista.com used to do great accounts (not sure now), or lycos, MSN etc...