In order to access a document on the Internet, it must reside on a Web server.
If you have a Personal Web Server in your computer, copy your publication to a folder available to the server including all files that were created in the Main folder create an link in any document to the _main.html file in that folder.
If your publication resides on a server of your internet-provider, you may transfer the completed publication to the server using Publication Transfer. Then all you need do is create a link from an existing document to the _main.html file located in the proper folder on your server.