Change "Lost Your Password" to "Forgot Your Password". - CSS Option.

functions.php

<?php

function login_styling() { 
	?>
    <style type="text/css">
		#nav > a {
			visibility:hidden;
			display:block;
			text-align:right;
		}
		#nav > a:after {
			content:'Forgot Your Password';
			visibility:visible;
		}
		#backtoblog { 
			text-align:right; 
		}
    </style>
	<?php 
}
add_action( 'login_enqueue_scripts', 'login_styling' );

?>