Hello how can i make my custom field appear on user registration

Hello,

After creating custom fields.
Where can i put this php so i can get it to appear on my registration form ?
https://boost.my.id/wp-login.php?action=register

I tried to add it using code snippet plugin but none seems to appear on registration form

Thank you
Joie

<?php
add_filter( 'rwmb_meta_boxes', 'ficid_add_kontak' );

function ficid_add_kontak( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'  => __( 'Kontak', 'ficid' ),
        'id'     => 'kontak',
        'type'   => 'user',
        'fields' => [
            [
                'name'          => __( 'WhatsApp', 'ficid' ),
                'id'            => $prefix . 'whatsapp',
                'type'          => 'tel',
                'desc'          => __( 'Masukkan angka saja, Masukan 87876565 jika nomor HP anda 087876565', 'ficid' ),
                'placeholder'   => 87654321,
                'required'      => true,
                'prepend'       => 62,
                'admin_columns' => [
                    'position' => 'after title',
                    'title'    => 'Whatsapp',
                ],
            ],
            [
                'type' => 'heading',
                'name' => __( 'Alamat', 'ficid' ),
            ],
            [
                'name' => __( 'Jalan / Unit', 'ficid' ),
                'id'   => $prefix . 'alamat_jalan_unit',
                'type' => 'text',
            ],
            [
                'name'    => __( 'Provinsi', 'ficid' ),
                'id'      => $prefix . 'alamat_provinsi',
                'type'    => 'autocomplete',
                'options' => [
                    'jakarta'        => __( 'Jakarta', 'ficid' ),
                    'jawa-timur'     => __( 'Jawa Timur', 'ficid' ),
                    'papua'          => __( 'Papua', 'ficid' ),
                    'sumatera-utara' => __( 'Sumatera Utara', 'ficid' ),
                ],
            ],
            [
                'name'    => __( 'Kota / Kabupaten', 'ficid' ),
                'id'      => $prefix . 'alamat_kota_kabupaten',
                'type'    => 'autocomplete',
                'options' => [
                    'kota-jakarta-barat' => __( 'Kota Jakarta Barat', 'ficid' ),
                    'kota-jakarta-pusat' => __( 'Kota Jakarta Pusat', 'ficid' ),
                    'kota-mojokerto'     => __( 'Kota Mojokerto', 'ficid' ),
                    'kab-mojokerto'      => __( 'Kab Mojokerto', 'ficid' ),
                ],
            ],
        ],
    ];

    return $meta_boxes;
}