Sometimes it's a private blog, and that's all there is to it. If all you want
to do is limit your blog to only registered users, look no further. Simply
install this plugin, and stop worrying.
安装:
Verify that you have PHP5, which is required for this plugin.
Upload wp-authenticate.php to the /wp-content/plugins/ directory
Activate the plugin through the 'Plugins' menu in WordPress