Depending on what type of request you send, a Get or a Post, the additional parameters will change to reflect the selection.  These are parameters that will be appended to the URL following a question mark and separated by an ampersand:

https://www.example.com?GetParam1=Value1&…

Get Parameters

Name: Specify the name of the parameter as it will appear in the request.

Value: Enter the value associated with the name of the parameter.

Post Parameters

Name: Specify the name of the parameter as it will appear in the request.

Value: Enter the value associated with the name of the parameter.