Positioning a Socket

In my TopDownCharacter blueprint editor, in the components panel I’ve used the add component feature to add a Child Actor to my viewport. I’ve also within the details panel chosen the Child Actor Component’s Child Actor Class (see attached image) in order to use my existing Child Actor but the Child Actor’s Parent Socket is non selectable as “none”.

How do i choose my created socket if the Child Actor’s Parent Socket is non-selectable as “none”?

Maybe I am not understanding you correctly but it sounds like you’re trying to attach the child to the parent via the child’s socket.
That’s not how sockets work - you attache a child’s pivot point to the parent actor’s socket by the parent actor’s socket name.

You have to place the socket on a bone of the skeleton asset you are using for the character. Then you use an attach to actor node and type in the socket name.