In February, I asked the same question as you.
I have an old account for which I forgot the password.
And I forgot even the password for the Email address which I put in this site.
So the account has been trash on the Web, but it has my name, photo and so on, and anyone can google my profile page.
I feel very uneasy about it.
I understand its my fault, but I want to delete the old account and feel refreshed.
Does nobody know the way to delete it?
Is there the way to make contact with the Administrator?
Can you please give me information on that?
But nobody has given me any answer. I guess it is not only you and I that are troubled about the same problem.
I hope the Administrator will show some good way.