Are you asking how to generate a temporary password when the password has been lost? You'd do this through the login form, by entering the e-mail address and leaving the password field blank, then clicking the second button instead of the first.
Is this what you're saying isn't working? Is it giving an error message? What's happening?
You may want to e-mail firstname.lastname@example.org with the WikiTree ID and the e-mail address you're entering. Tami can make sure that the e-mail address you're entering is the one on the account.