Please go to the list of users first:
Overview => User and Participant Management => List of All Users
Search for the person by entering the respective name or e-mail address and click the button "Search".
If you cannot find the person, he/she probably has not created a user account for this conference yet.
In that case, please ask the person to create a new user account now.
If you have found the person, please click on the name to see the user's details.
This page also shows the last login time, the user name and the password, provided that it was automatically generated and the user has not changed it yet.
Double-check now if the e-mail address is correct and matches the e-mail address of the user who has sent you the request.
If everything is OK, you can use the link "Send Password to User" in the right-hand column to send a new password to this user if necessary (see image 1).
Hint: Every ConfTool installation has a separate user database for privacy reasons. Sometimes people created a user account for another event and now think they can use this account for every conference. Please point out that this is not the case.