No, you cannot edit the email address of the active users in your account. However, you can edit the email address of the unconfirmed users (users who have not yet accepted your invitation to join the Zoho CRM account).

Follow these steps to change the email address:

1. Log in to Zoho CRM with Administrator privileges.
2. Click Setup > Users & Control > Users.
3. Select Unconfirmed Users from the drop-down list.
4. In the User's details page, click Edit for the corresponding section to change the email address.
5. In the pop-up box, modify the email address of the user and click Save.
   An invitation email will be sent to the user's new mail address. The user has to accept this invitation.