Register a new user on firebase

i am new working with firebase and i am making a login and register windows for an app using firebase. Right now the log in worked fine for me as long as i created the account from the console This is what the login code looks like but then if you want to create a new account you click on that button down there and it will take you to a new viewcontroller window, there i added things to fill to make a new a account and i used FIRAuth.auth()?.createUserWithEmail(<email: String>, password: <String>, completion: <FIRAuthResultCallback?(FIRUser?, NSError?) -> Void#>) here a picture of how the code looks like picture of the code and the imageview When i try to register a new user i get the doesn't work message and i really don't know why it doesn't create a new user bonus question when i make it work how do i make it go from that window to another?