Solution:
add it to your single.php
<?php auth_redirect(); ?>
This function will check if the user is logged in and if he is not it will redirect him to the login page http://codex.wordpress.org/Function_Reference/auth_redirect
Solution:
add it to your single.php
<?php auth_redirect(); ?>
This function will check if the user is logged in and if he is not it will redirect him to the login page http://codex.wordpress.org/Function_Reference/auth_redirect