If you want to edit an existing category head over to the category you want to edit. You should then be able to see a wrench icon. This will take you to the category settings. In my example I would be editing the ‘Meta’ category.
Thanks for the quick reply. Either there was a UI bug or I was missing something.
I think the bug was that even if I was on the category I couldn’t access the wrench icon without it having a drop-down suggesting “New Topic”.
However, I was able to access the parent category settings and when I returned on the sub-category it displayed the wrench icon and brought me to settings.