I have a web form and I need that info sent to a post url this is one of my form fields

<tr class="formLabel">
<td height="22" align="right">Last Name</td>
<td align="left"> <input name="vlasttname" type="text" tabindex="6" />

Now I need it to post to


and I guess this is the data type for the last name field for the posting URL

Data Type - string
Required - Yes
Mapped Field - No
Field Name - LastName
Description - Last Name

and help would be much appreciated.