To change your email address for logging in, email email@example.com with the subject "Login Email Address" and the following:
your current login email address
your new login email address
To change your email address for receiving Signal notifications:
1. Sign in and go to “Edit account details”
2. Update the field: "Email address which receives Signal updates"
Note: Updating this field will log you out but it will NOT update your login email address.