I already have my project cloned on github but just learned about this service and wanted to check it out.
Landing on the homepage, I typed in the name of my project as prompted:

It generated a correct d.o. url, but an incorrect git url (no username). I could not find a way to change this, but since it was the only thing to do, clicked the green button to see what would happen...

...Is what happened 😦
Seems like I missed a step. How do I input my github username? The correct path to my github project is https://github.com/colemanw/webform_civicrm.git