In your blog dashboard, go to your Posts from the menu on the left side.
Locate the post you would like to edit or delete.
Hover over the post in the menu. If you wish to DELETE the post, click "Trash". The post will be removed to your Trash folder (it can still be accessed and restored if you made a mistake).
If you want to EDIT the post, click the "Edit" option after hovering over the title of the post. This will bring you back to the familiar posting screen where you can make the necessary adjustments.
You can also click the "Quick Edit" option, which will allow you to make changes to the basic information of the post.