This is the recommended way of installing any WordPress plugin available on the official plugin repository.
Notice: you con use this method only for the Free Edition of the plugin.
- Open the WordPress Dashboard of your website
- Navigate to Plugins → Add new
- Search for Red Eyes Froggy Buttons using the search bar located on the top-right side of the screen
- In the displayed search results click on Install Now on the License Manager for WooCommerce card
- Click on Activate if you wish to activate the plugin immediately