You might need some design help. The site isn't clear on what the main core function of the web app is. I would consider putting the two screenshots on the front page of the app.
Yes, obviously I'm a bad designer. I'm surprised that you say it's unclear what the function of the web app is. It's described right at the top. Also, it's funny you say to put the screenshots on the home page. I had it like that for over a month, but everyone said to put them on other pages... :)