Those who attended today's session and did a sincere job of testing, you not only helped other teams find bugs, but also became better testers yourselves, which will make better developers too. Don't forget to include in your Project Portfolio page a list of bugs your reported today (with links to corresponding issues) so that it is reflected as a project-related work you performed.
What to do about the bug reports your team received? Instructions are given under v1.4/acceptance testing
One big lesson from today's testing session is the value of complementing automated scripted testing with exploratory manual testing. Some students even found a bug that was in the original AB4 none of the 70 teams (or the AB4 dev team) noticed before today, despite the high test coverage of AB4!
Another lesson is the value of the tester attitude that you need to adopt to find bugs. Developers tend to test their own products gently, subconsciously staying within areas that they know to work. When testing someone else' work, it's easier to break that limit and navigate to more error prone areas of the app. Ideally, you should learn to adopt a tester attitude even when testing your own app.