To play the elf on a shelf, you need to be creative and have fun with it. First, you'll need to get an elf doll or stuffed animal. Next, you'll need to set up a scene for the elf to be placed in. The scene can be anything that you think would be fun and magical. You can have the elf playing with toys, reading a book, or just sitting on a shelf. Once the scene is set up, take a photo of the elf in the scene and post it on social media with the hashtag #elfonashelf.