Now that you are admitted, you will use Appalachian student portal – AppalNet. You've also been assigned an Mountaineer Apps email account. Before using either service, you'll need to reset your password.
You can access your Appalachian email from anywhere via gmail.com– just remember to enter @appstate.edu after your username. If you are already logged in to another GMail account, you'll need to click "Add Account" in the top right of GMail or "Sign in with a different username."
See Getting Started with Google to set up your email.