Changed MACOSX ID and broke wallet

Hi All

I changed my apple ID on my MAC and that broke the wallet. I have my private key but no other details. I also have a backup wallet but when I load that it shows connection error in red.

I am not very affair with how the config of this wallet works. Could anyone point me in the right direction as to how I can get access again? I did complete the migration awhile back so thats all done.

Thank you in advance