1) change their ID and Password
2) remove their e-mail addresses (you can move their e-mail address to the
Comments field) which prevents them from retrieving their new ID and Password
using the "Forget your ID and Password" link on the Sign-In page. To
remove their email, click the email address in the Helper list grid, or click
the "Edit E-Mail Notifications" link on the Edit Helper Window. Then click the
red "Delete Address" link.
