You need to set the url to point to the ASP page and the method to post. The POST data can be set in several different ways depending on how many variables you have. The easiest (one variable) way is to construct a string that consists of the form variable name, ‘=’, and the data and map that into the data/string field for the service.
For example if the form variable is orderID, you’ll want to map into the data/string field:
multiple variables can be mapped in either by changing the string to something like:
The http service will handle URL encoding the data for you. Alternatively you could use the data/args for multiple variables; the choice is yours.