Connect Oracle Form Builder 10g to Oracle Database 10g Express

Hi,
I'm new to Oracle.
I've installed both form builder and database 10g express.
I tried to connect form builder to HR sample database in 10g express with the following:
user name: hr
password: hr
database: hr
but I received message: ora-12154: tns could not resolve the connect identifier specified.
Can anyone help me on that? Do I need to change the tnsnames.ora?
If yes, what should I need to change in order to connect to the HR sample?
Thank you.

Yes you need to have an entry in the tnsnames.ora file for you database service name or sid. The service name or sid is usually XE unless you changed it when you installed 10g express.

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