So, we both noticed the same thing at the same time.
I clicked on the My Day tab and entered Monday as the date because I have the park reservation for that day. I was able to edit the selections there and picked GOG. But, when I go back to the Tip Board, there is still no Edit Selections button.
I clicked on GOG to see if ILL was still available. And when I swiped up to refresh the page it scrolled back to GOG. This is not as efficient as refreshing by clicking on Attractions and Shows, but I wonder if it will be different on the actual park day.
This could be an intentional step to discourage “testing” by people without park reservations that clogs up the system. I wonder if on Monday GOG will appear at the top of the Tip Board because I selected it through the MyDay.