The Connection Dialog and the fields available there ( host, port, user, database, SSH ) are explained in the Connection dialog page
OrientDb can be downloaded as zip, unpacked and started by executing server.bat.
Before starting it edit the file config/orientdb-server-config.xml and replace in the section users
Restart the server. The configuration file should have something like this:
You can test the connectivity by starting bin/console.bat
connect remote:localhost root root