¿Cómo loguearse en PL/SQL Developer?

[gt_int]

Bueno ya lo encontré, puse esto:

ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)

DEMODB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = demodb)
)
)


LISTENER_DEMODB =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))



Pero aún no estará bien configurado porque cuando accedo a PL/SQL Developer no me salen usuarios a elegir y demás.