WordPress.org

Download and move "Countdown to Next Post" into your WordPress plugins directory.

Activate this plugin on your admin panel.

Widget

You can activate this plugin as a sidebar widget.

Manually Insert into Sidebar

Instead of using the widget, you can also manually add the following code into your sidebar.php file:

<li>
<h2>Next Post</h2>
<ul>
<li>
<?php function_exists('scott_timer')?scott_timer():NULL; ?>
</li>
</ul>
</li><li id='countdown'><h2>Countdown:</h2>
<ul>

Insert into a page or post

If you want to insert the "Countdown to Next Post" into a page or post, you can add the following shortcode into the HTML editor for a post or page.

[countdown_to_next_post]