How to Automatically Input Code to a WordPress Post

1. Log in to your self-hosted WordPress blog. Click 'Appearance' and then click 'Editor.'
2. Click 'Single Post (single.php)' or whichever PHP file in the current WordPress template corresponds to single posts. This link appears on the list of PHP files on the right side of the page.

3. Look for a line similar to the following example:

4. Insert the code below the code. This will position the code immediately after the post content.
5. Click 'Update File.'