You can edit your Contact Email address by making a couple of "tweaks" in the Body and Contact Address Information text editors on your About page.
Here we go..
1. Hit Website
2. Now go to the Pages section of your account.
3. Select the About page.
4. In the text editor, select the Contact Us text.
(Make sure you select the exact length of text. Don't select spaces either side of the text)
5. Hit the Link icon.
6. Now, replace the original entry with your preferred Contact Email address in the Link URL field.
Make sure you keep the "mailto:" text in there! Eg: mailto:firstname.lastname@example.org
8. Hit the OK button
9. Finally, hit the Green Save button to the bottom right of the main page.
..and you're Done!