You can generate a new random password for the user accounts that you select
from the list. An email with the new password will be sent to the email address
of each chosen users.
If you choose to change the password of your own user, then your current session
will expire immediately. You will need to log into the admin panel with the new
password that will be sent to your email. If you are unsure of this, do not
select your account from the list.