Having vaguely decided to join, you may add the letters 'LOAD' after your name. If you are also a 'Woefully Inert Dullard Emeritus' then you can add the letters 'WIDE LOAD' after your name.
But none of this is of the slightest importance. Don't do anything involving expenditure of unnecessary (or necessary) effort. Whatever.
(Jehanine, MESA, WIDE LOAD)
[The acting Omnibenevolent Polyfather in Gold would like to observe that membership of the Legion of Apathetic Discord is automatic, and in order not to be a member you must opt to not join. This helps to preserve the Legion's high standards of inaction. To join: do nothing.]