To change your email, go to the MintVine homepage and click the drop down menu in the upper right hand corner of your home page, just to the right of your listed points. Click "Preferences" then "Email", and there you will be able to enter your new email address over the old one. Be sure to click "Save Changes" in the lower left hand corner so your profile updates. The direct link to user preferences can be found here.
The system will require a confirmation from your old email address to make the update. If you do not have access to your old email, contact MintVine support and we can update it for you.