Double-click flag so that the music syncs! You can replace characters by going into their costumes and replacing the poses with your characters' poses. You can also change some of the animation code if you want it to look different.
I don't have a clear source on the hand sprites, but I believe they were made by @johnthe117. (I had found a sheet of different hands inside this project https://scratch.mit.edu/projects/1376492616)