If you have a web site address hosted somewhere you should also have a way to add files to your site using an ftp program.
You hosting company should have given you the login and password info.
If you are "hosting" it via drop box, you upload it to the public folder. You can check out this tutorial Upload your game to Dropbox
if you haven't already.
The same set of files that you upload to Dropbox would be the same that you would ftp to your web site server.