EMB-QUOT HELP 
  Use your arrow keys for movement <Up> and <Down>.
  Use your <Left> and <Right> arrows to move back and forward in the 
  message.

  Use the <Space> bar to toggle whether or not to quote a specific line.

  When all the lines are selected that you wanted to quote, hit <Enter>
  to continue to the message editor.

  If you do not want to quote anything, just press <Enter> with nothing
  selected.

