Demo install not include author box but it still can be enabled which will display very nice author box after single post.
#1 Author Box
- Go to Appearance > Theme Settings > Singular Content
- Check “Enable Author Box Globally”
- Publish Changes
Set author/user gravatar, description and social links by editing user profile at Admin > Users
Steps to Add Gravatar
Step 1: Sign up for a Gravatar Account
If you already have a WordPress website established, first navigate to the Gravatar website and sign in with the same credentials you use to sign into your WordPress dashboard.
Step 2: Manage Gravatars
Once you are successfully inside of your Gravatar account, the email address that is associated with your WordPress website links your website to your Gravatar account.