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https://wordpress.stackexchange.com/questions/127636/change-register-url-on-wp-login-page

<?php
// override register link
add_filter( 'register_url', 'custom_register_url' );

function custom_register_url( $register_url )
{
    $register_url = get_permalink( $register_page_id = 976 );
    return $register_url;
}

// 976 is the page ID that you want to replace the link of register