Please follow the below steps to configure Popular Post/Page

• Go to Appearance> Customize> Homepage Settings>Popular Post Settings 
• Enter Popular Posts Title and Popular Posts Content.
• There are three ways to you can choose the posts to be displayed on the section, i.e. Posts, category, and custom.

Posts 

• Choose Popular Post/Page source as Posts
• Choose Post Type
• Choose the number of Posts to display.

Category 

• Choose Popular Post/Page source as a category
• Choose Popular Post Category
• Choose the number of Posts to display.

Custom 

• Choose Popular Post/Page source as custom

• Click Add new Article
• Enter Article Title, Article Image and Article URL

• Click Add new Article to add more articles.
• Click Publish.