Here's a screenshot of my Usergroups Signature set-up. Everything is checked Yes!
I'd rather not get into adding mods. I know there is a setting someplace that will turn them on. Years ago I set up anther forum that I'm still running and I remember having the same issue. Someone told me how to fix it and it was simple, but I just don't remember! That's why I've searched every menu option looking for something would turn them on.
Here's the screenshot...