If when you imported the program database/user database you answered Yes when asked if you want to use these as your new database(s), then the directories are entered automatically. However you can still review the settings on the relevant tab after you have imported the database(s).
Before using the Nero database just take a little time to make sure that the settings are right. To configure these settings, select File, Preferences and then the Database tab. You will see that there are three setting areas.