Hi Alison-
I’m very sorry to hear that you can’t log into your website. Once you restore your transfer, the password on your “real” site will be the same as the one on your Cloud WordPress website. That means if you built it from scratch using Cloud WordPress, and never reset your password, it is random and there is not a way to retrieve it.
Here’s a tutorial outlining 5 different ways to reset your password. In addition, your web host’s support team will also be able to help you reset your password.