The code snippet needs to add in a function.php file in your WordPress blog, and the code will take care of rest.
Cation: please take a backup of the function.php file in order to restore if something goes wrong. Incorrect editing of the function file might break your WP site.
// Custom Scripting to Move JavaScript from the Head to the Footer
function remove_head_scripts() {
remove_action('wp_head', 'wp_print_scripts');
remove_action('wp_head', 'wp_print_head_scripts', 9);
remove_action('wp_head', 'wp_enqueue_scripts', 1);
add_action('wp_footer', 'wp_print_scripts', 5);
add_action('wp_footer', 'wp_enqueue_scripts', 5);
add_action('wp_footer', 'wp_print_head_scripts', 5);
}
add_action( 'wp_enqueue_scripts', 'remove_head_scripts' );
// END Custom Scripting to Move JavaScript