When you open a free 14-day SubHub trial, you'll automatically be logged into your website's control panel.
If you need to log back into your control panel, go to your own website's homepage, click on the Login link in the top navigation menu. You'll then be directed to the login page.
You can also go to: https://www.subhub.com/static/login
Log in with your credentials and you'll be presented with your website's login URL.