Within Teamwork Projects, you can change the email address that you use for your account in your profile settings.

Click your profile icon in the top right corner of the screen, and choose Edit My Details from the dropdown menu.

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In the edit details modal, go to the Essentials tab. You will have the option here to change the email address associated with your account. Click Update in the lower right to save your changes.

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Updating another user's email address

If you are a site administrator, site owner, or have permission to manage people and companies, you can change the email addresses of other users.

Go to the People area of your site and select the People subsection.

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Hover over the relevant user and click the edit pencil to the far right of their name and details.
 
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Alternatively, select the name of the user to open their profile view. You can then click the Edit User button in the upper right of their profile.

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For more information, see: Adding extra email addresses