Tutorial: How to Edit a WordPress Post
To edit a post if it already exists on your site, go to Posts >> All Posts in your WordPress dashboard. Click on the title of the post you want to edit in the list of Posts. If your list spans several pages, you can click through each page or enter your post’s title in the search box. You can also edit the number of posts shown on one screen by going to Screen Options (top right beside Help) and Change the
If you want to simply change the title, slug, publish date or category of the post, you can do a Quick Edit and make this change directly from the All Posts Screen.
To do this, just hover over your post title and a new menu items will reveal themselves directly below the title. Click Quick Edit from this menu.Make the changes and click the Update button to save