Connect to website in Visual Studio via FTP
Open VS and select file open website
Select FTP from the side menu and the fill in the fields. You should probably be connecting to the root of your pub folder. You can select another folder is it have been marked as an application in IIS. If not you will get errors if VS creates a web.config in a folder that is not marked as an application.
VS may ask to update you web config to the latest version. To play is safe select no.
No you should see you pub folder in the solution window