ZM ALR 2.0.0 -- Adding a new field

functions.php

<?php

/**
 * Adding a new field to the register form
 *
 * These are the steps needed to add a new field in ZM ALR (2.0.0+)
 * They are as follows:
 *      1. Add your field to the array of fields
 *      2. Check the validation of your new field
 *      3. Do something with the value AFTER successful registration
 *
 */


/**
 * Step 1 -- Add your field
 * 
 * Your field should can contain the following params:
 *      $new_field['extra']       Any extra attributes, i.e., 'data-age="" data-key=""'
 *      $new_field['required']    If field should have the HTML "required" attribute
 *      $new_field['size']        Input field sze
 *      $new_field['name']        HTML name
 *      $new_field['id']          The HTML element ID
 *      $new_field['placeholder'] The HTML5 placeholder text
 *      $new_field['type']        Current types are: text, password, email, checkbox, html, submit
 *      $new_field['html']        If 'type' is set to HTML you can use 'html' to add any HTML you want
 *      $new_field['value']       The initial value
 * 
 * @param   (array)     $fields     The array of existing fields
 * @return  (array)     $fields     An array containing existing fields and the new field
 * 
 */
function my_new_field( $fields ){

    $new_field['my_new_field_id'] = array(
        'title' => 'Age',
        'type' => 'text'
        );

    # c/o http://stackoverflow.com/a/1783125
    # Insert at offset 2
    $offset = 2;
    $fields = array_slice( $fields, 0, $offset, true ) +
                $new_field +
                array_slice( $fields, $offset, NULL, true );

    return $fields;

}
add_filter( 'zm_alr_register_form_fields', 'my_new_field' );


/**
 * Step 2 -- Validate your field and handle the status
 *  
 * If the validation fails the status should return an array containing the following:
 *      $status['description']  The message displayed to the user
 *      $status['cssClass']     The CSS class, set this to: 'noon'
 *      $status['code']         The code, set this to: 'error'
 *
 * @param   (array)     $status     The status code
 * @param   (array)     $values     The values found in the form, i.e., $_POST
 * @return  (mixed)     $status     The status, if valid, return true
 */
function my_new_field_status( $status, $values ){

    $age = trim( $values['my_new_field_id'] );

    if ( empty( $age ) ){
        $status = array(
            'description' => 'Age is required',
            'cssClass' => 'noon',
            'code' => 'error'
        );
    }

    return $status;

}
add_filter( 'zm_alr_register_submit_pre_status_error', 'my_new_field_status', 15, 2 );


/**
 * Step 3 -- Do something with the new value
 * 
 * If the status returns true then the new user will be added to WordPress. You can 
 * retrieve your value from $_POST, and sanitize/validate, then do something with the value.
 *
 * @param   (int)   $user_id    The user id
 * @return  (void)
 */
function my_new_field_submit( $user_id ){
    // echo "ID: {$user_id}\n";
    // echo "params: ";
    // print_r( $_POST );
    // die();
}
add_filter( 'zm_alr_register_after_successfull_registration', 'my_new_field_submit' );

doesn't work for me, every time i try to add something to: function my_new_field_submit( $user_id ) {}
the register process get stuck, and doesn't redirect to where it should.

Where should I add this file/code?
Could you provide an example (say, for a phone number)?