Hi,

Taken a look at your link.

Netsuite online form template are for using on sites hosted on Netsuite only. The tag <NLFORM> and all other tags are not HTML tags, they are tags that will only be interpreted by their server side program. There is no example on off-site form, or any API that allows posting of off-site form data into Netsuite.

Netsuite does not even list a CGI or PHP file for off site forms to post form data.

For example, the tag <NLFORM> is suppose to be interpreted by Netsuite server and print out the HTML form tag with information such as the action and method. Action means the url that the form is suppose to send data to.

Conclusion,

It is not possible to create a form on your WordPress and post data to Netsuite, because there is no API for this, and Netsuite only accepts data from it own hosted online form.
The hosted online forms url are in https which needs SSL, and default WordPress install is not in SSL. even if there is a Netsuite API for forms, you will still need to setup SSL on your WordPress which may need re-installation.

Thanks.