else if (commandWord == CommandWord.REGISTER)
        {
            Scanner reader = new Scanner(System.in);
            String inputline;
            String username;
            String fullname;
            String password;

            clearScreen();
            System.out.println("------------------------");
            System.out.println("|**Welcome To Twitter**|");
            System.out.println("------------------------");
            System.out.println();
            System.out.println("Here you can register yourself as a new user");
            System.out.println("After registration, you will be taken to the homepage, where you can login");

            System.out.println("What will be your username?");
            System.out.println("Your username can only contain lettres and numbers, no spaces.");

            System.out.print("> ");
            username = reader.nextLine();

            boolean ok = twitterApp.checkAvailable(username);

            while(!ok)
            {
                System.out.println("This username appears to be taken, please try another one");
                System.out.print("> ");
                username = reader.nextLine();

                ok = twitterApp.checkAvailable(username);
            }

            System.out.println("What will be your password?");
            System.out.println("Your password can only contain lettres and numbers, no spaces.");
            System.out.print("> ");

            password = reader.nextLine();

            System.out.println("What is your full name?");
            System.out.print("> ");

            fullname = reader.nextLine();

            twitterApp.addUser(username, fullname, password);

            clearScreen();

            printWelcome();