Should be easy enough. When logged in as an admin click "Edit This Page" to go into the CMS.
The top part of the page you can modify directly in the Edit tab for the page.
The contact forms are generated by Includelets. So you need to go to the Layout tab, double click on the includelet and edit it.
Once you've edited the includelets you can preview your changes, or publish them to make it live.
Joe - Voice Admin