Register option and membership plugin conflict

The "register" option is in the wp-login.php file as long as Settings>General has "Anyone can register" checked.
But, the membership plugin asks to remove that check mark in order to take over the registration piece and then the wp-login.php has no option to "register". Only existing members can log in.
How do I get the "register" option available on the wp-login.php page? I want that to be my only landing page for my url for my site. This way people can log in or register.
Please help me figure this out.
Thanks!!