Maybe I am overthinkinng this. Or maybe I'm functioning with only 1/4 of a brain....
but I simply cannot find/see...

where a normal user of CB (v 1.3.1) can set up their profile to subscribe to all topics (so they receive email notification when anyone makes a post to that topic).

This should be a simple and intuative option but I can't find it.
I've enclosed the screen shot of the subscription option but it doesnt allow me to do what I want bcs the choose action drop down selection only provides "unsubscribe selected".