Note: this article only applies if you log in to Stitch using your email address and password. If signed up using your Facebook account, the email address you use will be the same one you use for Facebook.
To change the email address you use with Stitch, perform the following steps:
Go to the Account Information page
Type your new email address into the box beside "Your email"
After typing the new email address, click the "Change" button on the right of the new email address.
A confirmation email will be sent to your new email address inbox. Check your inbox and follow the directions in the email in order to confirm that your email address has been changed.
Once you have confirmed that your email address has been changed, you must use the new email address to log in to your Stitch account.