This is in the setup of your Hosting Server that you have specify the same directory path than the master.
If you don't know the path, create for example a slave site called "slave1" with URL = "
slave1.com" and nothing else.
This will create a slave site that must have exactly the same directory path than the master.
See the message that will be displayed in blue when the website will be created.
Copy paste it somewhere to keep it if you want.
It writes you in the message the directory path that you have to specfy in your hosting server.
If you can the domain name by the real domain that you will setup in the hosting server tool, this should work.
All the stuff is in your hosting server configuration and not really in JMS as you don't have to specify anything. JMS only display you what you have to enter in your hosting server.