Can't connect to FB database using ADO and ODBC

Hello,

I'd like to use ADO/ODBC to connect to my FB database (I'm using
Delphi5 if that matters).

I downloaded and installed the ODBC driver listed on Firebird website
(IscDbc.dll, etc.). However, I do not see it in a list of available
drivers when attempting to create an ADO connection string for my ADO
component (TADOConnection).

How to access it?

Thanks for your help.
D.P.