That is the usual CumulusMX startup screen.
As noted in the DOS command prompt screen
Cumulus is running at http://*:8998/
(Replace * with any IP address on this machine, or localhost)
In a browser enter that URL but in place of the * in the example replace it with your computer's local IP address, something like
http://192.168.0.13:8998/ but use your own IP address followed by the :8998/
or in the browser enter
http://localhost:8998/
and the interface will come up.
You can do this from any computer on your home network.
Enjoy,
Paul