how to send data to a web page from a VB form using POST

[icyfenix]

I'm a developer for my company and my job is to make things move faster and reduce overhead/labor dollars using software.
We are in an all-Microsoft environment.
The problem I am having is this: There is a website that our clerical staff has to use to update our insurance company every day on claim status. It has to be done anywhere from 150-350 times a day(we are a service center) and the website is very slow. It can take 10-20 minutes to fill in this form due to the site's bandwidth restrictions so I'd like to put this form in a VB application and have it just send the data, reducing the time by around 15 minutes per transaction.

Thing is, I have the interface and all that shiny stuff written, I'd like to send some values to the page, but I have no idea how to use either httprequest objects or whatever it is I need to use to send data to a page as if I were the original form.
It's a simple html form so there's nothing fancy-schmancy about it really, just a basic
<form method="POST" id="myform" action="action.asp">
Name:<input type="text" id="name" />
Rank:<input type="text" id="rank" />
Serial Number:<input type="text" id="sn" />
</form>
type-y thing.

Thanks VERY much- I'm a new dev working without any support from people who know what they're doing so I have to lean heavily on the internet.
I don't usually post places(unless I find something that seems to be hard to find then I repost) since I can usually find things but not always.