Hi Jerry,
My apologies.
You have added the css correctly.

Can you please point me to the site? Just need to check if it is a javascript conflict?

Thank you
Brajesh

Thank you Jerry.
I noticed two things.

1. The css selector is applied to the list item and not anchor. In that case, ‘bp-ajaxr’ is not a good choice. Instead, please use ‘bp-signup’

2. You are using kleo theme that includes magnific popup, so the popup won’t work yet. Please put this code in your functions.php or bp-custom.php and both the ajax registration and kleo popups will work fine.

add_action( 'wp_enqueue_scripts', 'kleo_remove_magnific_files', 100 );

function kleo_remove_magnific_files() {
	if ( ! is_user_logged_in() ) {
		wp_dequeue_script( 'magnific-popup' );
	}
}

Please do let me know if it works for you or not?

Thank you. Marking it as resolved.

Regards
Brajesh