Unzip and upload the plugins folder to your /wp-content/plugins/ directory
Activate the extension through the Plugins menu in WordPress
Enter the WordPress Customizer to begin using the plugin.
For more information on installing and managing plugins see here
There are two main locations where you will interact with this extensions functionality; on the add/edit post screen and in the Customizer. On the former, you will insert your pricing tables using the Pricing Table shortcode and in the latter, you can customise its appearance.
The Pricing Table shortcodes
You can insert the shortcode by manually typing it and the relevant attributes, or you can use the included Shortcode Generator which is easier.