How to use the ramp-frontend.ramp_frontend.forms.LoginForm function in ramp-frontend

def login():
    """Login request."""
    if app.config['TRACK_USER_INTERACTION']:
        add_user_interaction(db.session, interaction='landing')

    if flask_login.current_user.is_authenticated:
        logger.info('User already logged-in')
        session['logged_in'] = True
        return redirect(url_for('ramp.problems'))

    form = LoginForm()
    if form.validate_on_submit():
        user = get_user_by_name_or_email(db.session,
                                         name=form.user_name.data)
        if user is None:
            msg = 'User "{}" does not exist'.format(form.user_name.data)
            flash(msg)
            logger.info(msg)
            return redirect(url_for('auth.login'))
        if not check_password(form.password.data,
                              user.hashed_password):
            msg = 'Wrong password'
            flash(msg)
            logger.info(msg)
            return redirect(url_for('auth.login'))
        flask_login.login_user(user, remember=True)
        session['logged_in'] = True