Click here to view how to edit the default username and password e-mail.
By clicking the 'send' button (as shown above) the e-mail with the username and password is send to the reviewers.
A pop up screen is shown to confirm your action.
After you've confirmed that you want to send the e-mails, the option to send the email disappears.
The option reappears when you add new reviewers?
In the query of the Reviewer module you can find the column 'mailsent'. '1' indicates that the Reviewer e-mail has been sent.