Hello Jonathan

The .web file format is the default document format for web designer. And it is the way you edit your website.

Any changes you make in the .web document file are applied when you publish your website.

You can add form code to a placeholder (a simple rectangle you create with the Rectangle Tool the size of the form). Create the rectangle to the size desired. With the placeholder rectangle selected, open the Website Properties > Placeholder section and paste your code into the HTML Code HEAD or HTML Code Body areas (click either of the HTML Code buttons and paste your script/code). The form will appear when you preview your site and when you publish it.