Getting Started

Where do I put my authorisation code

I have 3 domain names now and the third one is from a previous page I had. The domain name shows in my list but I was sent a code and I am not sure what to do with it. I tried to transfer it to my current account but it says can't add it it is already there. I have setup forwarding but when I enter the domain name into the search on internet it doesn't bring up my web page.