On the Dashboard (the screen that lists your draft and published newsletters), click the Cogwheel icon and choose Your Account from the menu that appears.

On the popup window that appears, you'll have the option to type in a new First Name, Last Name, Email Address, or Password. When done, click the Save or Update Password button.

If you login with Google and change your email address in iNewsletter then you may not be able to log in with the same Google account, unless the primary email address for your Google account is changed too.

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