You can make a tab/link in navbar and use one of the links below. First link will find the posts second link will find threads.
HTML Code:
<a href="search.php?{vb:raw session.sessionurl}do=finduser&userid={vb:raw userinfo.userid}&contenttype=vBForum_Post&showposts=1">{vb:rawphrase find_all_posts}</a>
<a href="search.php?{vb:raw session.sessionurl}do=finduser&userid={vb:raw userinfo.userid}&starteronly=1&contenttype=vBForum_Thread">{vb:rawphrase find_all_started_threads}</a>