They are typical of brittle brass situation, nothing more.

Top right corner next to the reply, quote buttons, is an edit button to click on, they you can chose to delete the post by clicking on the DELETE button in the bottom left corner of the 'edit' screen that pops us- then confirm the delete.

If there is no "edit" button, then enough time has passed between now and when you posted it, for it to become permanent, unless a moderator will delete it for you. I wouldn't worry about it - at all.