I need to change the DNS record which was inadvertently changed. The CP will only accept an IP address for the Winhost servers. What IP address should be entered?
Which records did you change, or rather, which do you need to re-enter? If you need DNS reset for a domain in your account (which I would recommend if you've made changes that you can't undo), you should contact support. They can take care of that for you and set everything back to the default values.