1) If you have installed JMS on the
www.example.com website to convert this www website into a master, you don't have to create a fresh slave.
You can use this master to share the users.
As I have already explained in previous reply, you have to change in the tutorial video 16 the fact that you share with the <master DB> instead of the slave 1.
2) NO
If you want to share with the master, you don't need to create a fresh slave1.
Discard this part and go directly to the sharing definition.
3) Instead of creating a rule to share the slave1, you have to create a rule to share the master <master DB>
In the "template site", replace the selection of "slave 1" by "<master DB>"