You can easily manage all your account settings via your the account dashboard at zenmate.com.
Log in with your ZenMate credentials and go to the 'Email' section of the dashboard.
Enter your new email address and your current password and click on 'update email'. A verification email will now be sent to the new address. Click on the link in the email and the change is done.
Log in with your ZenMate credentials and go to the 'Password' section of the dashboard.
Enter your current password in the first field, followed by your new desired password and a confirmation of the new password. Click on 'set password' and the change is done.
Lost your password?
In case you lost your current ZenMate password, request a new one following the instructions in the article "I forgot my ZenMate password. What should I do?".