[Zope] Newbie: How to create a Oracle connection (DCOracle)

Hi List, Finally, I installed DCOracle and works fine. But, how to create a Oracle connection inside Zope? I tried to add a SQL Method and received this warning: Warning: There are no SQL database connections. You need to add a Zope SQL database connection before you can use a Zope SQL Method. I not found nothing about that in documentation. Could you help me? Gustavo