There is no way to change the email address in Engage. You will have to create a new team member with the new email address.
Log in to your current Engage account.
Go to the Advanced tab.
Under My Team, click on Add Team Member.
Fill out the form, be sure to select the Role you want to assign, then Send Invitation.
Once you get the invitation email, click on the link, fill out form and submit.
If that email address is currently linked to any Engage account, when you get the link, click on where it says If you already have an account click here... then log in.
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