How to get the debug on post working?

Hello,

I would like to know if someone could explain to me how this part of PHP storm works please.

I would like to test my registration page by passing variables and see how they affect my functions.

I see this screen here:

But cannot work out how I should add the data when used as "POST" or even "GET", could someone show me an example please?

Here is my form:

What is the workflow when using Xdebug please?

How does it works? Do you pass the variables directly inside PHP storm or fill them up inside the form on the local copy(in the browser) and use the xdebugger plugin or chrome?

I really wish to start using xdebug(which is installed correctly on my machine) but do not know yet how to use it properly.

Thanks!