As Big Brother is based on a client/server topology, you can collect data on one machine and analyze it on another machine which can access each other via a network. By default, bbana assumes that the machine on which it is running is the machine that has the data you wish to analyze. You may change the host to which bbana should connect and/or the port to which it should connect using this menu.
You can change host and/or port by using the Tab key or the up and down arrows to move between the two fields and then the left and right arrows and the Backspace or Delete key to modify their values.
When you are finished, just hit the Enter or Return keys to save your choices.
So long as you continue in the same analysis, the choices you make will remain the same until you have changed them.