Sign into Bannerbox and retrieve your API key from the settings menu. API keys are unique for your organization and can be manually regenerated once every 24 hours.
Install a script tag to the header of your site. Replace YOUR_API_KEY with the API key from the settings menu.
<script src="https://bannerbox.io/client/bannerbox.js?apikey=YOUR_API_KEY" id="bannerbox-client"></script>
Make sure to use the above code snippet as is and replace YOUR_API_KEY only.