Change my password

I have just made a announcement at hotel.com…with a old email address that I can’t reach anymore. My account is old, and I uses it to announce my apartment for rent.  How can I get in contact with Hotel.com to change it? I have tried myself, but it will not let me change my email address. And for me it seems like it’s easier to go to the moon than get any help. Right now I might get some bookings that I can’t see, and I’m a little bit stressed and confused now.