1) Go to Content -> Blog/Event/Promo -> View Posts menu items at left vertical menu:

2) Select "promo" checkbox and find your Promo item. Then click on "Option" action button

>> actions to "Edit", "View Posts" and "Delete" is opened

3) Click "Edit" button:

>> new page is opened 

>> bred Crumbs is displayed as ""Home -> Content -> View Posts -> Update Post"

4) Make changes at form and click "Submit" button

>> Successful message is displayed for the user

5) Click "Back to Posts" button

>> User is redirected back to the View Posts page.

>> Item that was edited displayed all saved changes