Fills form with login info

        :param username: user login
        :param username_field: name of field to fill with username
        :param user_password: login password
        :param user_password_field: name of field to fill with user password

def fill_login_form(self, username, username_field, user_password,
                        user_password_field):
        """Fills form with login info

        :param username: user login
        :param username_field: name of field to fill with username
        :param user_password: login password
        :param user_password_field: name of field to fill with user password
        """
        self.fill_form_field(username_field, username)  # set username
        self.fill_form_field(user_password_field, user_password)