Recently, a new functionality was introduced to Blogger which makes it possible to display author profile below posts without adding any code to the blog's html. The Author profile box looks similar to what you get
if you add the Blogger About ME gadget to your blog and it makes most sense for multi-author blogs as it will make it easier for readers to identify each post's author. Thanks to Ogbonge Blog
This functionality lets readers identify the author of a post by displaying the name, Google+ profile picture and a small description of the author below the post. Clicking on the Author's name, takes the reader to the Google+ profile of the author. This without doubt, will help the author in getting more Google+ followers.
To display your profile under your Blogger posts, you must have replaced your Blogger profile with Google+ profile.
Thereafter, you can log in to your Blogger dashboard, go to "Layout" and click the /"edit"/ link of the "Blog Posts" gadget. You should see a new pop-up window:
>> Tick the "Show Author Profile Below Post" box as shown in the screenshot. Also ensure you ticked the "Post by" box.
>> SAVE your settings and view your blog posts.
If you have a customized template and you don't see the author profile below your blog posts, you may need to reset your Blog1 widget in the template editor for it to be added.
How To Reset Blog1 Widget Template
>> Go to "*Template*" > *Edit HTML*
>> Click the "Revert widget templates to default" tab
>> Select *Blog1* from the list of widgets and click the "revert selected widgets" button.
>> *SAVE* your template and view your blog posts.
I'm sure it will work for you if you really followed the above steps.
N/B: To edit the bio displayed in your Blogger author profile, go to the "About" section of your Google+ profile and edit the "Introduction".