Comments

MSmart wrote on 9/29/2013, 4:54 PM
Click the Search link above right, change the search by date field to "any date", and enter your username in the User Name field.

While you can delete individual posts within a Topic by clicking on the Delete link at the bottom right of your post, you can't delete the entire Topic.
vkmast wrote on 9/29/2013, 5:02 PM
You can also click your user name to see your posts listed on your profile page
(Posts by User)

Yes, you can Delete as MSmart says, though deleting your posts afterwards may seriously destroy the logic in the thread.