Magistra doesn't want to be a member anymore. So, how to get rid of the tag?

The easiest way is to contact Council to remove your tag.  \(that's how they get added as well, via Council  [council])

Moved to Q&A. Council is probably the best way to go, yes.

I'm a little curious how long it'll take, actually.

I can not say about the King of Marind Bell, but me and Azull both have the ability to edit tags and descriptions of our people. Since we are given this tool, we have been using it (I believe) in a wise way and only to those related to us and we also got to make new Death Guards this way. Wouldn't it work the same for MB's King to remove that tag the same way within a minute?

Only if he already has the tag powers, though.

Speaking for the GG group, we don't have anybody with the tag ability currently because we're still living in anarchy (and enjoying it, kind of), so if somebody wanted to leave the Embers, they'd need to get to the council to have things adjusted (not including that our name is broken and only the wookie knows how to make it work xD)

Her tag is removed, it has been since she posted.