Go to Appearance > Customize > About Page Settings > History Section.

• Enter the title of the section in the Section Title field
• Enter the description of the section in the Section Description field
• Click on Add new History to enter a history timeline
  • Enter the date of establishment in the Upload Established Date field
  • Enter the title in the Enter Title field
  • Enter the description in the Enter Short Description field
• Click on Publish Changes.