You can install Klaviyo Connect from the Plugin Store or with Composer

From the Plugin Store

Go to the Plugin Store in your project’s Control Panel and search for Klaviyo Connect. Then click on the Install button in its modal window.

With Composer

Open your terminal and run the following commands:

# go to the project directory
cd /path/to/my-project

# tell Composer to load the plugin
composer require fostercommerce/klaviyoconnect

# tell Craft to install the plugin
./craft install/plugin klaviyoconnect

Further Reading

See Loading your plugin into a Craft project for more details on installing plugins.