You can change the email address that you use to log in to your Jilt on the My Account page (under Settings > My Account).
In the Account details tab, click the Edit link (pencil icon) in the User details section to open up your details for editing.
Set the Email, as the new email address
Look for the confirmation email sent to your newly set email address and 'click' Confirm my account
Your account is now set to use your new email address!