As you read it in the post, this is HTTP Server dependent.
If you are using cPanel, you have to create an AddOn domain in which you provide a "Document Root".
When done, apply the procedure similar to the tutorial video CP-04 where you defined the slave site domain =
www.DOMAIN.com, DOMAIN.com
Deploy dir = the document root directory assigned to the domain in cPanel.
www.jms2win.com/tutorial#jms12x-CP-04
Concerning the architecture of the directories, we suggest that you follow the tutorial video 0.b - slide 21-24
www.jms2win.com/tutorial#jms12x-0b