To integrate Klaviyo, you'll need an API public and secret key, and the list ID for the list to which you want the Advocate and Friend to be subscribed.
Start by logging in to your Klaviyo dashboard and clicking "Account" in the upper right-side navigation.
Then click the "API Keys" menu option from the Settings dropdown. Click the "Create API Key" button to generate a new API key. Your Public API Key is listed in the top paragraph on that page and your Private API Key will be listed in the table row down below. Copy both API keys.
Next, navigate to your Lists, click the List you want to sign your Advocates/Friends up to, and click on the Settings link. Copy your List ID.
Finally, log into Conjured Referrals, click the Integrations menu option, and scroll down to the Klaviyo Integration section, and enter all the values you retrieved. Don't forget to hit the Save button at the bottom of the page when you're done!