1. Navigate to the ch2-private-item-text folder of the WordPress plugin directory of your development installation.
2. Open the ch2-private-item-text.php file in a text editor.
3. Add the following lines of code at the end of the file to register functions to be called when user data is stored upon initial creation or when a user is updated:

add_action( 'user_register', 'ch2pit_save_user_data' );
add_action( 'profile_update', 'ch2pit_save_user_data' );

4. Add the following block of code to provide an implementation for the ch2pit_save_user_data function:

function ch2pit_save_user_data( $user_id ) {
    global $user_levels;
    if ( isset( $_POST['user_level'] ) &&
         !empty( $_POST['user_level'] ) &&
         array_key_exists( $_POST['user_level'], 
                           $user_levels ) ) {
        update_user_meta( $user_id, 'user_level',
                          $_POST['user_level'] );
    } else {
        update_user_meta( $user_id, 'user_level', 'regular' );
    }
}

5. Save and close the plugin file.
6. Edit one of the existing users on the site or create a new one to see that the user level value is saved.