This post was published 3 years 11 months 28 days ago. Therefore, it may well be out of date. Do not reply on the contents of this post being accurate. WordPress 2.3 allows you to tag posts.
In the theme I use, to display the tags on your blog’s post you need to edit your ‘single.php’ file.
Log in to your WordPress dashboard then select Presentation > Theme Editor
Select the ‘single.php’ file from the right-hand sidebar.
Locate the following line of code (it’s located just after <!--Post Meta-->):
<!--<?php if (function_exists('the_tags')) { ?><strong>Tags: </strong><?php the_tags('', ', ', ''); ?><br /><?php } ?>-->
The HTML comment tags ‘<!-- … -->‘ (at the begining and end of this line) need to be deleted (these tags comment out code thus preventing it being read in a browser).
Finally, click the ‘update file’ button then refresh your site to view your tags (assuming you’ve added tags your posts).
Like most things, it’s easy when you know how.