So far this was accessible only from the menu on your profile page. Now, you can click Show your posts when you log in (user info is on top, on the left) and it will display all your posts in the forum.
How was this done?
Open: /Themes/ThemeName/index.template.php
Find:<a href="', $scripturl, '?action=unreadreplies">', $txt['show_unread_replies'], '</a><br />'
Replace With:
<a href="', $scripturl, '?action=unreadreplies">', $txt['show_unread_replies'], '</a><br />
<a href="', $scripturl, '?action=profile;u=', $context['user']['id'] , ';sa=showPosts">Show your posts.</a><br />'