How do I cancel my account?

I am a paid subscriber to the adoption reunion registry and I tried to cancel my subscription. After searching high and low on the web site I found a tiny cancel link. I clicked it and it asked for my password, although I was already logged in under that password. I kept entering and reentering my password and wa told it was invalid. When I tried to change the password it wouldn't take and the message from the system was unclear as to why. I've complained twice without a reply from adoption.com. Has anyone had the same difficulty or know how to resolve it? Thanks.