No, the user will need to be deleted from the Meltwater account and re-added with the updated email and information. 

To delete an existing user, follow these steps:

1. Click the Account drop-down in the left-hand navigation bar
2. Select Manage Users
3. Hover over the user you want to delete
4. Select Remove user on the right-hand side

5. Select Ok

To re-add your user with the updated information, learn more about Adding a New User.