1. You will need to go to your DASHBOARD by either clicking on the Blogger logo on the upper left anytime when on your blog,
clicking on the POST LIST
search for your post by using the search bar on the upper right or scrolling down manually.
Once you have found the post you want to edit, HOVER below the post title until you see the options EDIT | VIEW | SHARE | DELETE. Click edit to revise your post.
2. The other way to EDIT your post is to go directly to it and scroll down to the end. You will see a PENCIL icon, click it and you be able to edit your post.