Go to your “Admin” page, click on “Presentation,” then click on “Theme Editor.” Open the theme file “Sidebar.”
You need to insert the line
<? if (function_exists(‘do_calendar’)) { do_calendar(); } ?>
where you want the calendar to appear.
For example, if you want it to appear below the “Pages” listing, insert it after the line
<?php wp_list_pages(‘title_li=<h2>Pages</h2>’ ); ?>
I hope this helps.