Quick Economy Shopping Cart not showing up

My quick shopping cart, shop.recruitertraining.com, is not populating when I type the URL. It gives me the following message: 


This site can’t be reached

shop.recruitertraining.com took too long to respond.

Any idea as to what the issue could be? I called in two days ago and the gentleman that helped me said something about the shopping cart not pointing to the DNS. He said he corrected it and it should work within the next hour or 24 hours. 
Thanks again.