Adds a hint to the first and last name fields at checkout.

my_pmpro_add_name_checkout_hints.php

<?php // do not copy this line.
/**
 * This recipe will let you add hints to default WordPress fields (also child sponsor fields)
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_default_fields_checkout_hints() {
	?>
		<script>
		jQuery("#username").parent().append("<p><small class='lite'>I am a hint for username.</small></p>");
		jQuery("#password").parent().append("<p><small class='lite'>I am a hint for password.</small></p>");
		jQuery("#bemail").parent().append("<p><small class='lite'>I am a hint for email.</small></p>");
		jQuery("#first_name").parent().append("<p><small class='lite'>I am a hint for first name.</small></p>");
		jQuery("#last_name").parent().append("<p><small class='lite'>I am a hint for last name.</small></p>");
		jQuery('input[name="add_sub_accounts_username[]"]').after("<p><small class='lite'>child username</small></p>");
		jQuery('input[name="add_sub_accounts_email[]"]').after("<p><small class='lite'>child email</small></p>");
		jQuery('input[name="add_sub_accounts_password[]"]').after("<p><small class='lite'>child password</small></p>");
		</script>
	<?php
}
add_action( 'pmpro_checkout_after_billing_fields', 'my_pmpro_default_fields_checkout_hints' );