Be careful out there! Clicking on the … menu on the upper right and selecting “Configure UI” does indeed let me into an editor of the page I select and I can indeed edit it with success… sometimes. Sometimes the text comes up highlighted red and I can’t change anything, sometimes the text doesn’t come up at all, sometimes it works just fine.
The consistent part of the on-screen editor is it sometimes works.
edit: When I get the red display when I try to edit. if I close everything and relog in with my Chrome browser and try to edit again… the red goes away and I can edit away. (until it decides to go red on me again later)