To edit an existing file, in one of the supported languages, you  use
  tokens.   Since tokens exist for many reserved words, simply type the
  token name and press the EXPAND key (CTRL/E).

  For example, typing IF followed by a CTRL/E causes a template for  an
  IF  construct  to appear on your screen.  (Use the SHOW TOKEN command
  to acquire a listing of all the predefined tokens.)