In the BS2000 Explorer view's tool bar press
Define a connection to BS2000
or open the context menu on empty point in BS2000 Explorer, and select New > Connection.
In the New Connection wizard you must specify the following:

Now the new connection will appear in the BS2000 Explorer view:

To connect the connection to BS2000 select Connect in the context menu of the connection. At the first time or if access authorization is not valid the BS2000 credentials dialog is prompted.