If a user is having trouble logging in to TotalABA (forgot their password, never received the activation email), you can send them a reset password link by opening their user record and clicking the Reset Password button at the top of the form.

 If you just change the email for an existing user, they will be required to verify the new email via an automated link before the change takes effect. If the user has never logged in to TotalABA you can also check the Generate new password and notify user immediately option at the bottom of the user form when changing the email to bypass the verification.