Login with your Email address. This must match an address set up by your course administrator.
If you haven't set a password yet, or if you have forgotten it, use the Set password page. It will send you email with a token (an identifier that look like this: 716077a2-793f-44ac-8df1-b6337c8275a5). Copy and paste it into the block on the form
You will also need to create an account on codepost.io. Make sure you use the same email address as here. Codepost has separate passwords, so you'll need to set it there.
Warning: JupyterHub seems to be served over an unsecured HTTP connection. We strongly recommend enabling HTTPS for JupyterHub.