Ok for anyone else too stupid to read all the docs.....
in the message body type your message and then finish off with the line
!remove
this will add the remove message for you.
You can use other message codes too:
The following codes are available:
Global Codes
!fname - User's First Name
!lname - User's Last Name
!fullname - User's Full Name
!email - User's Email Address
!remove - Remove Link
!mytext - User-defined Text
!date - Formatted Date
!date2 - Formatted Date