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Here's how you can change your username/email address:

- Login to via your computer's browser

- Select your name in the top left

- Select Settings from the dropdown

- On the "Settings" screen select "Account"

- Place your cursor in the "Email" field and enter your new email address.

- Click the Update button that appears

A verification email will be sent to the email address you've just entered, please follow the instructions in the email to verify that the newly updated email address is valid.

After doing that you'll need to sign out of the app on all your other devices then re-sign in with your new email address.