To edit a post that 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 provided. If your list spans several pages, you can click through each page or enter your post’s title in the search box.
Make the changes that you want to effect and then click the Update button.
If you’re changing the post content, click on the post’s title to view the edit page. Make your changes to the post as needed. Once you’re finished, click the Update button to save your edited post.