Thanks, Stella. :-)
I just went back to investigate further. Discovered the functionality is invisible until you hover over the module you want to edit.
-- Dear #Upwork Team UXers: INVISIBLE CONTROLS = ANTI-UX. Grr.
It looks like you don't have any portfolio items currently. You can add samples of your work to your portfolio by going to Find Work > Profile and clicking on the plus icon next to Portfolio: