Cannot attach a new camera to a mannequin socket

I took the third person example and deleted the third person character and added the mannequin as the character.
I added a socket to the head to attach a camera to as a first person camera.
I added a camera component.
In the camera details it will not let me select a parent socket (like in the mannequin), saying an inherited component cannot be changed.
There is some old reference to this, but no answers that I could find, or recognize as such.
So, how do I get the camera attached to the mannequin socket?
If I can do that, I want to add a second camera as a third person camera.