Post data from a form

hey guys been reading articles on posting data. Can someone help me with this?

I have a form and set it to pass field data
I need to post it to a payment site. They provided me with a form example like this:
Any ideas how I can pass my data from Gravity forms to this form?

<form name=”post” method=”post”
action=”https://secure.emandates.co.uk/Pages/Registration.aspx?.Client=e90057aa-51e6-4eb2-a36b-
897c1439a5f4&.PaymentPlans=874fe40b-dfef-4ec8-a4a8-e895e84dc59e”>
<input type=”text” name=”txtTitle” value=”Mr” />
<input type=”text” name=”txtFirstName” value=”John” />
<input type=”text” name=”txtSurname” value=”Doe” />
<input type=”text” name=”txtReference” value=”MYREF00001” />
<input type=”text” name=”addr1” value=”1, The Example Road” />
<input type=”text” name=”addr2” value=”Example Town” />
<input type=”text” name=”addr3” value=”Example City” />
<input type=”text” name=”searchPostCode” value=”T35T 1NG” />
<input type=”text” name=”txtPhone” value=”0190 908070” />
<input type=”text” name=”txtEmail” value=”test@example.co.uk” />
<input type=”text” name=”txtAccNumArr” value=”0-0-0-0-0-2-8-4” />
<input type=”text” name=”txtSortArr” value=”08-09-08” />
<input type=”text” name=”txtAccountHolders” value=”Mr. John Doe” />
<input type=”text” name=”txtRegularAmount” value=”35.45” />
<input type=”text” name=”end” value=”until_notice” />
<input type=”text” name=”lstPaymentDay” value=”1” />
<input type=”text” name=”PaymentMonth” value=”4” />
<input type=”text” name=”PaymentYear” value=”2013” />
</form>

It would be something like:
https://secure.emandates.co.uk/Pages/Registration.aspx?.Client=e90057aa-51e6-4eb2-a36b-
897c1439a5f4&.PaymentPlans=874fe40b-dfef-4ec8-a4a8-e895e84dc59e&txtTitle=”Mr”&txtFirstName=”John”&
.......&
PaymentYear="2013"

But all the hard coded values I typed in would be the filed names on your form. You would then put this ghastly URL in the form properties in the confirmation tab, choose redirect. Put your URL https://secure.emandates.co.uk/Pages/Registration.aspx?.Client=e90057aa-51e6-4eb2-a36b-
897c1439a5f4&.PaymentPlans=874fe40b-dfef-4ec8-a4a8-e895e84dc59e

And then click the check box Pass field values via query string and build the keyword={fieldid:3} parameter string using the merge field data drop down.

Example.
phone={Phone:1}&email{Email:2}

Not sure if this will work, but that is what this feature is meant to do.

So in the case above how to I map my fields to the fields of the recipeint form?
In the case of phone - they form uses (txtPhone)
So would I use
txtPhone={Phone:1} in the query string?

Thank you, that works!