Hello, I am Jamie Robe, author of the Disabling Join Using The ZMI Security Tab
You need to bring up the ZMI in a browser or new tab, if you don't already have it so (now you see why I used FireFox or IE7 which support tabs). The ZMI looks like:
You should see the Security tab in the top of the ZMI. Click on it to bring up the next screen:
The Security screen is a long long list of Permission and Roles. You need to scroll down until you see "add portal member", circled in red below:
- Under the Anonymous column, click to uncheck it. You do not want Anonymous, which means not logged in visitors, to be able to join (add portal member).
- Make sure the box in the Manager column is checked, so that you have the option of adding additional users.
Scroll down to the bottom of the ZMI, and you will see the Save Changes button, as below:
