This one is unchecked: "When entering a page that is secure/not secure".
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So I don't understand how to find the correct words/symbols for the Certificate Authorities to add to the list, or even if I am SUPPOSED
to do that.
I think it's just a way of you your permission to be "checked out" by the web site in question.
Go to your Edit menu, and select Preferences. Under Privacy & Security, you should find Certificates. (I use Mozilla, which is very similar to Netscape. Your selections might be hiding elsewhere.)
From here, you are able to Manage your Certificates. I don't have any, so that makes managing them a snap.