Clicking on "Active Topics" at the top will bring you to threads that have been replied to most recently. I usually click there whenever I hop on the forum to see the latest posts.
To specifically search your own threads, click on the white arrow besides the "Search" drop tab ---NOT the search box at the very top, but the one in the bar between "New Posts" and "Quick Links." That will drop down a menu with options. The bottom options allow you to search 'My threads' or 'My posts.'
here with my Mecki-- born 2/12/19