Connection Failed error in Live Chat admin area

When I open settings in my admin area at i see notification “Connection failed”

If you get the “Connection failed” notification in your admin area, please perform the following steps:

1) –  Make sure that your Chat plugin is successfully activated. Login into your website WordPress administration area;

– Find ‘Chat‘ on your sidebar;

– Click ‘Login’ in ‘Open administration area’ section;

– Check ‘Existing user’;

– Enter your email and password that you used during Chat registration;

– Click ‘Login’. After that you will be brought to your admin area