Add selling point adress in Google maps to opencart site

Hi There, Need help with adding an adress to this url [login to view URL] Just type for instance the next postal code: '5701' and you'll see a result. In this result we need to add a new adress: Don't know where to do it, either on the site or not. Thing is that former manager of this site got fired recently, but this still needs to be solved. Can't be hard, that I know! Of course, I have all the login info , ftp etcetera. Let's start!!!