Here's a link to a quick video showing how to remove and install a new steering wheel and clock spring in a 2007 Ford Edge:
We just purchased this Edge and the steering wheel was in very bad condition; stained and worn out.
It had faulty volume control buttons and the check air bag light was on. The local dealer recommended replacing the clock spring to fix the air bag light. Both of these issues where resolved by installing the new wheel and the clock spring.