Hello
Yes, Sara is correct, if all you want is to display a list of the categories that you have added posts to then just add this to the sidebar.php file or wherever you want it to appear.
Code:
<ul>
<?php wp_list_cats('sort_column=name&optioncount=1&exclude=10, 15'); ?>
</ul>
That will display the categories by name with the number of posts in each category next to it and exclude the categories with the ID's of 10 and 15.
Should you not want to exclude categories you can remove the part for that:
Code:
<ul>
<?php wp_list_cats('sort_column=name&optioncount=1'); ?>
</ul>
You can find more on this page: http://codex.wordpress.org/Template_Tags/wp_list_cats
Hope it helps
Bookmarks