Inserting Text With A Click

My forums are currently running VB 3.0.3. I want the moderators to be able to click a link inside the message box, and some predefined text to go to the message window. I know how to make the link show up in the editor, how to code the permissions, etc. I just don't know how to get the text in the window when the link is clicked. I really would like something like this, can someone please help?