you put the following line in your user-startup or startup-sequencerun >nil: birdie ? <env:birdie.prefs
it doesn't really matter where you place this as long as it is somewhere after 'iprefs'
i personally have it as my last line in user-startup
the preference program should create the birdie.prefs file in env: and envarc: if i remember correctly.
the birdie.prefs file is actually the command line you would use when not using the preference program but stored seperatly in ascii form so that the preference program can easely edit it.