Depends on the OS. The Centura SQLBase client and driver needs to be installed first. If you are using Windows XP go to control panel -> admin tools -> Data Sources (ODBC). Under User DSN select Add. I am pretty sure you will need the SQLBase 32bit driver. Select it and do any configuration as nessessary. Then you need to make sure that your database connection is set up to use that diver. You do this in connectivity administrator.
I hope this helps,
Jason Beard, CBT