Using Webhook Data in Lindy: Guidance for New Users

Hi everyone! I'm new here and a bit confused on how to refer and use data from a Webhook. I see that the body of my POST request is received by Lindy as expected. However on the example from Lindy's support article on webhooks they have the option to refer to "request body" in the next steps - I don't see this option anywhere. I do have the option to pick "body" when selecting "AI prompt" but then I get something completely different than the body actually sent via the webhook, I get a custom made message containing some of the data from the request body, but some of it is just missing. I'd just like to refer to the exact parameters sent in the body.