Go to the original project(Link is up top)If the buttons at the bottom of your screen don't change, reload the page. Unfortunately, the colors do not change when you press them.
If you want to learn how to do this, @fortyonegames has a tutorial on the basics: https://scratch.mit.edu/projects/1311303013/ Thanks to FezziwigJuniorJunior for the original project Like And Dislike Buttons!. He also has a different one so go and check it out!