When I read a post that I want to reply to confidentially, I click on the envelope icon right next to "posted by (their handle)".  This brings up a "Compose" form with subject and recipient's handle pre-printed.  I go ahead and type in my message. However, there doesn't seem to be a "send" button to click so I don't know how to get the note off to them once I'm done writing.  What am I missing?[