Adobe Portfolio Page Cover Photo Change

SOLUTION: I got it on my own finally, as Adobe sent me useless info--it was the same stuff I found myself with a google search. So the key was "navigate to the Collection page". That was not at all clear to me.
So I googled 'where can i find the collections in adobe portfolio"...and that took me to an Adobe page with a very rapid video on how to find it. Fortunately I could watch it repeatedly until I figured it out.

The solution was to

1. Go to the Pages, then at the upper left click on the work "Work". That then shows the cover page.
2. HERE is where you will find the editing pencil ("Page") by hovering over the top left corner of that picture. It will reveal a pull-down menu which will allow you to then "edit cover image".

This is simple.

1. Hover over the page's cover area and click the blue edit button.
2. Select Edit Cover Image from the pop-up menu, then click Remove Image in the left-hand panel.
3. Publish site to commit changes. 
4. On your live site, refresh your browser cache (F5 or Ctrl+R) to confirm the cover image was removed.

Hope that helps.