How to configure my domain?

It's been a couple days since I checked the boards. The safest bet would be to contact KH support. I'm sure they could help you with that.

If I understand you correctly, you want to change the contact information. If so, then I believe KH would have to do that (as I don't recall seeing the ability to change that information in WHM). Of course, I could be wrong. Either way, you should contact them. I'm sure they'll be able to give you a definite answer.