My account is saying it is not linked

I get message to say my account is not linked, so I put in the registration reference from April this year and I get another message saying it is linked to another account. I have recently changed my PC.

It's linked to your GregCGF account. I can transfer it to this one if you want to use this account instead of the other one. Let me know.

Hi Leo - could you please merge the GregCGF account into this one. Thanks.