1. go to profile on the upper right hand side. click
2. go to settings and privacy on this drop down menu; click - at this point a sub-menu pops up; scroll down to activity log;
3. click on activity log - at this point another menu pops up on the left hand side with activity log at the top. scroll down to trash
4. click on trash and you can either restore or delete your post. Keep in mind the server has already saved this information on the main frame and is recoverable by Facebook.
Good luck and don't post anything you don't want remembered as it's all discoverable.