System Tags

[JN]

I'm trying to sort out tags on our forum and came across System Tags in Tag Settings.
I've added a few there, but haven't figured out, how to add them to topics.
If it's relevant, we use tag whitelists for categories, so users can choose from a predefined list instead of adding their own tags.
Below the System Tags setting it says: "Only privileged users will be able to use these tags."
But where can I view and manage, who has privileges to use the system tags?

[baris]

Privileged users are administrators/global moderators & moderators.