Use the Edit menu on the editable source window as follows:

  Action         Function
  ------         --------

  Cut            Cuts selected text from the window and
                 copies it to the clipboard.

  Copy           Copies selected text from the window to
                 the clipboard without removing it
                 from the window.

  Paste          Pastes text from the clipboard to a
                 text-entry field or region.

  Clear          Clears the text selected (highlighted)
                 in the window.

  Find/Replace   Finds and replaces the next instance.
    Next
    (or Ctrl/N)

  Find/Replace   Finds and replace the previous instance.
    Previous
    (or Ctrl/P)

  Refresh File   Loads and displays the latest version
                 of the file in the selected editor
                 buffer.  This is convenient for checking
                 .LOG and other results files during
                 debugging.

  Close File     Removes the currently selected edit
                 buffer from the display and menu,
                 closes the file, and frees associated
                 memory.  Prompts the user to save or ignore
                 any modifications to the edit buffer.