When you have selected a request, the request pane will show up. This will allow you to modify all parts of the request:

• The URI/URL, and HTTP verb.
• The headers and URL query to send with the request.
• The body (if the HTTP verb allows a body), using either plaintext or one of Beak’s powerful rich body editors.
• Custom options for the request, such as automatically following redirects or not

The bottom of the request pane has a request preview, so you can see the HTTP formatted request data that will be sent before you execute the request.

Missing something obvious? Open an issue and it can be discussed.