Your first step is to make your pom poms obviously. I didn’t find the Clover pom pom maker to be incredibly intuitive right out of the box but they are super easy to use once you get the hang of it. I found this video to be a great starting point if this is your first time making yarn pom poms.
Once you have your pom poms made, string up a large needle and tie several knots onto some doubled up thread.
Give it a tug and test how secure it is. It’s amazing how well these little balls hold the thread! After several passes it should feel pretty tightly on there. When your satisfied, trim your thread. Do the other 3 corners and you’re done!