Add custom script to the footer to load a modal.

my_memberlite_wp_footer.php

/**
 * Add custom script to the footer to load a modal.
 */
function my_memberlite_wp_footer() { 
	?>
	(Remove this line and paste in your custom script)
	<?php	
}
add_action( 'wp_footer', 'my_memberlite_wp_footer' );