In this lesson, we'll log the user back in using the credentials we originally created in the first couple of episodes. In order to do so, we'll create a separate login screen that only contains two input <b>UITextFields</b>. To login this user, we will be calling <b>Sign In</b> instead of the create user method. Let's also go over a simple way to check for when the <bReturn</b> key is pressed and used that as a signal to login our user.