Yahoo Messenger now running or off I don't know please answer me Yahoo Messenger running aur off?

Instant messenger no longer exists. It was closed in July 2018.

Off. Yahoo closed it down ages ago. There is no more Yahoo Messenger. 

Verizon shuttered it more than two years ago and is no longer in existence. Try Facebook Messenger, Google Hangouts, or Skype as alternatives instead.

Yahoo Messenger was terminated, turned off FOREVER July 18 or 19, 2018. That was OVER 2 YEARS ago. It is GONE.