Normally, when you create a fresh slave site, you have nothing installed in the slave site.
This is like a new joomla installation.
So I don't know if you have created a fresh slave site as presented in the tutorial video 9 or CP-02 or CP-04 (I suppose YES).
If this is a fresh slave site, I don't understand why the Superfish Menu module is available.
Normaly none of them should be present when you create a fresh slave site.
So would you please send us the Superfish menu to our email present in our contact us
www.jms2win.com/contact
To install extension in a slave site, you can either re-install them with the back-end of the slave site or replicate a website that have this extension pre-installed or use the JMS tools that has the description of a limited number of extensions.
To know which are the extension defined for the JMS tools, you can click on the "tools" help button and that you can also see
www.jms2win.com/component/content/article/135