There are a few ways to hide your Instagram post from someone if you want to keep it private. You can use a password, use an app that hides your posts, or use a third-party service like Hootsuite. If you choose to use an app, make sure that the app is set up to hide your posts by default. If you choose to use a password, make sure that it is strong and unique. Make sure that you never share your password with anyone else!