Hello,
Consider using the following JS Code at the bottom of the Page:
<script>
	jQuery(window).on( 'load', function(){
		var windowHash = location.hash;
		if( windowHash != '' && typeof windowHash !== 'undefined' ) {
			var $accordion = $(windowHash).parents('.accordion');
			if( $accordion.length > 0 ) {
				$accordion.find('.acc_content').hide();
				$accordion.find('.acctitle'+ windowHash).addClass('acctitlec').next().show();
			}
		}
	});
</script>
and then simply add the id Attribute to the .acctitle Element. Example:
<div class="accordion accordion-lg divcenter nobottommargin clearfix" style="max-width: 550px;">
	<div class="acctitle" id="accordion-login"><i class="acc-closed icon-lock3"></i><i class="acc-open icon-unlock"></i>Login to your Account</div>
	<div class="acc_content clearfix">
		..
	</div>
	<div class="acctitle" id="accordion-register"><i class="acc-closed icon-user4"></i><i class="acc-open icon-ok-sign"></i>New Signup? Register for an Account</div>
	<div class="acc_content clearfix">
		...
	</div>
</div>
Now, you can Link the Page using this Link with a Hash referencing to the ID: login-register-3.html#accordion-register .
This will definitely work fine. Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.