Here's what the question creation interface looks like – you can create any question, and there's a bunch of suggestions to help you get started:

Here's what it looks like when you've created some questions. I made these predictions with my partner, so you can see her predictions on the question that's expanded:

For more info, I'd suggest just using the website itself. It is designed to be super easy to use and self-describing!

The website is part of Fatebook, a tool for rapidly tracking predictions. Predict Your Year is a specialised page for creating yearly predictions (which is a popular activity for many people, e.g. inspired by Scott Alexander's annual prediction posts). You can read more about Fatebook in this LessWrong post.