Learn how to use the You – Child Theme.
A child theme is a theme that inherits the functionality and styling of another theme, called the parent theme. Child themes are the recommended way of modifying an existing theme.
Download the Child Theme from your ThemeForest downloads section.
Follow these steps to upload the zip file to your WordPress Themes area.
This Article is a great way to get started with Customizing your Child Theme. Read from the Customizing Your Child Theme section.