Snapchat is a messaging app that allows users to send and receive messages, photos, and videos. The app is available on both Android and iOS devices. To use Bitmoji on Snapchat, you first need to create an account and then sign in. Once you have logged in, you can find the Bitmoji icon in the top left corner of your screen. You can then use the Bitmoji icon to send a message with a picture or video. You can also use the Bitmoji icon to share a story or video with your friends.