How do I require a valid email address using malsup's validation plugin?

How do I require a valid email address using malsup's validation plugin?

Hi guys. I'm using malsup's validation plugin:
http://docs.jquery.com/Plugins/Validation

I don't quiet understand how to require a valid email address to be entered into a particular field.

There is documentation for what I wish to achieve here:
http://docs.jquery.com/Plugins/Validation/Methods/email

But I'm having trouble understanding it.

For a start, I can't quiet tell from examining the demo how a particular field is required to have a valid email address.
I can't tell how the script picks up which particular fields are required to have which rules.

I'd be grateful if someone could help me figure this out.