In the iFinance User Guide, it says that after launching for the first time, the registration dialog will open. What opens, though, is the database manager. How do I register now?
This segment in the User Guide will be updated soon. Please see the instructions on how to create your first database. Once you actually start using iFinance by creating a database, the registration dialog will open.
More information about iFinance is available in the User Guide. You can find it in iFinance's Help Menu or for download here.