There is a great interactive parts catalog which can be used to discover all kinds of tricky things:
https://catalog3d.winnebagoind.com/2018/321892.htm
But did you get a very large allen key with a folder of info like the manuals for each product? IF not, it is a regular 5/16 allen key that can be found local, just large for better grip.
It should fit in the center front and turn 1/4 turn to release the cover. It can help if you press down on the cover as trying to turn as they are sometimes tight. Inside, think of something shaped like your index finger which rotates to hook under a post?
EDIT:
Owners manual here:
https://www.winnebago.com/owners/own...r-manuals/2018
Page 3-11 shows the cover remove/replace.
__________________
Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!