I can see my website but required to update my A record

Hi, we use wordpress optimized account for sancerrethebrand.com with SSL installed. In most cases we can see the website online, however, we get notified by overseas users such as from Australia or NZ that they cannot see the website. When I open my account I get the following notice:

 

Your account setup can't finish without your help. Your Account Setup Can't Finish Without Your Help We can't automatically update your domain's DNS. Update your A record to : 166.62.112.xxx