Now, copy the above two files into your theme folder.
After copying, rename (rename) the two files as follows.
Finally, open header.php and add the URL of the files above </head>.
If your theme is a child theme, copy and paste the following:
<script src="<?php echo esc_url( get_stylesheet_directory_uri() ); ?>/allpost-contactform_custom.js"></script>
( 2021/December/06, 03:40:50, JST )