Customize Registration Page and add Page content

May i know how to customize the registration page of buddypress 1.7. such as:
1. Page Title - How to change the title "Create an Account " ,which file should i looking for ?
2. If i would like to display the content of wordpress page which selected for Buddypress Registration Page(e.g. display the wordpress page content at the top of the registration form of buddypress), how to do so ?