When you previewed your form template, the corresponding html file named in the HTML Page Name field saved to the same location as the template file.
You can upload the saved html file to any folder within your web site folder. If you upload it to the root of your site folder, the path will simple be your web domain followed by the name of the file. For example, http://www.yourdomain.com/Web2Form.html
Note: If you upload it to a subfolder, the path will have to reflect this. For example http://www.yourdomain.com/SubFolderName/Web2Form.html
Hint: If you name your HTML page as index.html, you can upload the file to a sub folder and then omit the index.html from the url path. For example, just http://www.yourdomain.com/SubfolderName
There is nothing particularly special about the html form except for the field ID names and the action within the field. You can choose to edit the html form if you prefer. You can modify the CSS elements or change the look and feel entirely. Just make sure that you do not modify the name attributes of the fields or the action within the form.