I cannot access to my website or admin page

Hi,

I’ve tried to change my website’s address in general settings/wordpress admin page.

And now I cannot access to my admin page or my webpage either.

If I go to the original website address, it redirect me to new website address I changed but showing

“This site can’t be reached
http://www.lookupj.com’s server IP address could not be found.
Did you mean http://www.lookup.com/?
Search Google for lookupj
ERR_NAME_NOT_RESOLVED”

What should I do?

The page I need help with: [log in to see the link]