To delete all or a part of your ad go to your verification email that was used to verify your post. Click on the "edit/delete" link in the email.

If you wish to delete just the pic/s in your ad check the "Delete" box next to the pic/s, then scroll down to the "Delete" button, click, and the pic/s in the ad will be deleted and the written ad will remain. Once deleted you cannot recover it.

And lastly you can delete the entire ad by scrolling down to the "Delete" button, click, and the entire ad will be deleted. Once deleted you cannot recover it.