If you linked your Gmail email to your Taskworld account, you will have issues updating your email address.
Follow these steps:
Log out of your Taskworld account
Head back to the Taskworld website and click the Log In button
Click the Forgot Password? link
Follow the on-screen instructions to request a password reset email
Click the link in your password reset email. Taskworld will prompt you to enter a new password
You can now log into your account using your email address and your new password.
You can also update your email address and password in Taskworld.
Please note: you must disable your ad block if you are using one in order to log in with Google SSO.