Include text at bottom of post for users in group

Thanks a million, @simon. I really appreciate it. I’m still very novice at themes.

Here it is: GitHub - literatecomputing/discourse-theme-group-signature: Append text to posts of members of a particular group · GitHub

I put the text of the link and the groups in theme settings. There is an alternate/second signature that has a customizable URL.

Is there a way to get a theme setting to use a selector, for example, the group selector?