Have a look at this FAQ
http://www.forestriverforums.com/for...fix-15553.html
The middle photo shows the tabs in the open position. It also shows the
outer cover raised but you don't want to do that! Just turn the tabs as shown
in the middle photo.
Remember to carefully and gently put the tabs back over the corners of
the flap when traveling or you will wind up with a broken and possibly
missing flap one day.
Welcome to the forum and Happy Camping!!