ACF fields used in wp-login.php

I am using S2Members for membership levels but the problem I have is I want to be able to search a few ACF I have created and want to use to give free access to people in those ACF fields.

I have the login page set up with custom fields and a conditional drop-down choice for free access. If one of them are selected then a certain level should be selected.

http://pmworldlibrary.net/wp-login.php?action=register

tweaky.com and elto.com gave up and refunded my payment for the script to make this happen.

https://wordpress.org/plugins/advanced-custom-fields/