Find the post you want to edit and click on the pencil icon next to your name. You will be given 3 options: Edit Post, Unpublish Post, and Trash. If you want to take the post off the site for now, click Unpublish. If you want to delete the post, click Trash. To make changes to the post, click Edit Post. Once you have finished, click Update Post. More detailed instructions can be found at the bottom of the How to Post page.