What is the steps to ingest the code to your website that will pull evidently metrics

Thank you vtjean! I followed upto IAM policies to use Evidently Create projects, features, launches, and experiments Manage features, launches, and experiments But below part in the link is not clear how to add the code to your own applications? It talks about the A/B testing with the Evidently sample application. But I couldn't find where do you need to add the code to your existing website app. Adding code to your application