For whatever reason you may find yourself wanting to go back and edit a post that oyu have already published. Here is how you do it...
You will start by logging into your blogger account and on the dashboard you will see the little icon that looks like two pieces of paper. Click on that and a menu will appear. You will click on the word posts and it will take you to a page that shows you every post you have ever done!
Next you will find the post that you want to edit. When you put your mouse on that post a little edit button will appear. You will simply click on that and make whatever changes you make Then got o the top of the post region and click update .
I hope that this tutorial was useful. However, to prevent from having to go back and edit very often I always preview my posts before I publish them.