Does not work

What is wrong with this app? First I could not log-in... Kept saying either my email or password was wrong even though I could log in to FB from my laptop. When I could log-in, the app would not open up any of the workout videos. I logged off and tried several times but could not get this app to work! Ugh. Is there a way to select zero stars? I dearly love FB and would love to use this app.

Tch2rd2 about Fitness Blender Workouts, v4.3.1