detailed_hello_world_push example is unclear

I'd be happy to update the readme if I can get some help understanding how to use this example.

I copied the example to `config/custom_components`, started hass, went to Settings -> Devices and Services -> Add Integration -> Detailed Hello World Push.

It is unclear what is supposed to be entered into this field. I entered "foo" and I get an error saying "Failed to set up". I assume this is the not expected behavior, but that is also unclear.