Unable to search online with Endnote x8, on Mac

"Unable to contact the online database.

Check that your internet connection is working.  Or contact the database’s vendor for availability " 

My internet connection is working perfectly fine. Just can’t search online databases on endnote. 

Any one has any solution for this? I’m really new to the EndNote

do you mean this? 

Preference> Find full text… and the pic attached

Thank you for your reply, Leanne. 
I’ve attached the problem that I’m having. I’ve even added the URL to University of Sydney library. But which ever resources that I use, I am getting the same error message. 

Whenever I tried to “Find reference update”, I got the error message too. I managed to find reference update the first day when I had the Endnote on my computer. But subsequently, only error message came up

Unable to contact the online database.

Check that your internet connection is working.  

Or contact the database’s vendor for availability.