Before you send out the e-mail with username and password link, you may need to make changes to the email template.
The e-mail template can be found under 'Mailings' --> 'System Emails' --> 'Reviewer invitation'.
The "Send Preview Email" button allows you to send a test mail, containing the username and password link, to a specific address. Here, you can also select the gender of the receiver.
The "Edit" button allows you to style the e-mail to your liking, by inserting placeholders or changing the text. You can also change the subject or add an attachment.
To have the standard e-mail content and settings, click the "Restore Default" button.