make sure your mosuse cursor is in the email body section before clicking on the plaus button.
you can change tit in the code by editing the following line:
"sessionVariables" => array(""),
to:
"sessionVariables" => array("NEW_PW"),
then change:
"mailBody" => "User name: [UserEmail]\nPassword: [UserPassword]\nPlease log in and reset your password to something you can remember.",
to:
"mailBody" => "User name: [UserEmail]\nPassword: [Session.NEW_PW]\nPlease log in and reset your password to something you can remember.",