On this page you can manage your subscription, which simply means you can unsubscribe, or change your email address by unsubscribing and re-subscribing with the new email address. Yes, I know, a bit clumsy, but that’s the way it is, I’m sorry.
The form allows you to include your first name (just to be friendly) but that isn’t a requirement – only if you’d like to.
Subscription management form is only available to mailing lists subscribers.