Happy to hear it works now.
Whenever you have a winning or a losing hand, you can click on "Accuse" below any stranger's name and you'll get a hand of six accusation cards. If you click on those cards, it gives a description of how that type of cheater cheats. This should help knowing what behaviour to look out for, and you can click "Do Not Accuse" and then "No Accusations" to go back to playing. Once you think you've identified a stranger, you can accuse them (the next time you have a winning or losing hand) by clicking on the accusation card and then clicking "Accuse" next to the cards. It you're right, they reveal themselves. If you're wrong, you lose a life. Hope that helps!