how do you want to integrate the page into your web-site? there are 3 options:

1. if it is a static page, copy the content into a text/HTML module, this will display the page within a container in the surrounding DNN page
2. if it is a dynamic page (form, etc:) you can use an IFrame module to display it within a container in the surrounding DNN page
3. you can link to your page from the menu by uing the redirection option (at the end of the settings page), this will launch your externam page in full window, i.e. you might need to provide a back link on that page or a menu redirecting to your DNN portal if needed.

HTH

if you want to include a form and store the results in the DNN database, either use one of the existing 3rd party forms modules, use UserDefinedTable or create a custom module.