Create a new page. Title can be anything of your choosing, but slug should be titled about. The content area can be left blank, because everything is driven from custom fields:

Everything else (like the titles and the video) is hard-coded in aboutus.php.
The Contact Us widget is also baked into aboutus.php. Go in there and change the $to and $subject variables.
You can add (or remove) fields in the file as well. To make a field required, have a class "required" like so:
<input type="text" name="your-name" value="" id="your-name" class="required">
Please test to see if the widget works. At best, it should:
$to when all the required fields are filled.