My Widget Is Not Working / My Events Don't Show Up in the Drop-Down
1) Can you verify that the Mixpanel credentials you entered were the correct ones? That's usually the issue re: getting your regular events to show up.
If that doesn't work, it's likely that you have Custom Events set up in your Mixpanel account.
Regarding your custom events, we actually do it a slightly different way than the regular Mixpanel widget. Instead, use our Private URL widget (Custom section).
Here's how it works: