How to find HTTP header for Text updates on a website? - html

Question

I am creating an application in vb.net that allows users to sign up for text updates via a simple form. When users hit the submit button on the form it will send a POST to the website with the actual sign up form and then the website accepts the data. When I go to get the HTTP POST off of the website it looks very odd and seems to change every time. I am using Live HTTP Headers to get the data. Here is a sample of the header content:
Content-Length: 952
-----------------------------61332911729981
Content-Disposition: form-data; name="_wpnonce"
1d45b60ac9
-----------------------------61332911729981
Content-Disposition: form-data; name="_wp_http_referer"
/
-----------------------------61332911729981
Content-Disposition: form-data; name="_ninja_forms_display_submit"
1
-----------------------------61332911729981
Content-Disposition: form-data; name="_form_id"
1
-----------------------------61332911729981
Content-Disposition: form-data; name="ninja_forms_field_1"
[phone]
-----------------------------61332911729981
Content-Disposition: form-data; name="ninja_forms_field_2"
unchecked
-----------------------------61332911729981
Content-Disposition: form-data; name="ninja_forms_field_2"
checked
-----------------------------61332911729981
Content-Disposition: form-data; name="_ninja_forms_field_3"
Submit
-----------------------------61332911729981--
Here is a sample of what I previously have gotten from Live HTTP Headers with a newsletter form for email alerts:
fields%5Bemail_address%5D%5Bvalue%5D=blahblah%40email.com&cc_newsletter%5B%5D=1&cc_referral_url=http%253A%252F%252Fpeabodyswineandbeer.com%252F&cc_redirect_url=&constant-contact-signup-submit=Sign+Up&uniqueformid=constant_contact_api_widget-2
Any ideas how to get the first one like the second one? I got them from the exact same section in HTTP Live Headers, but I have no idea how to use the first one to POST data to the website.