how to change the oracle account password?

Hi,

Does anybody know how to change the oracle account password?

I had forget the test environment oracle account password, and reset it in plsql.
But after that, I cannot login the baan anymore, the error message as:
504 database logon denied.

I had tried to use encrypt newpassword command, generated the password string, and paste it into the ora_group file. However it still does not works.

Does anybody know how to fix it?

Thanks.

Jeffers