Mixed Mode Authentication Conversion-Post Setup

I need help changing the authentication mode from Windows Authentication to Mixed Mode (for Project Server 2003). I am unable to find the Enterprise Management area. Evidently in this area, I can make this change. Is this the place to make these changes, or is there a better place? I am a novice, only days into this process. I need to setup a Project Server, and it needs Sql to breathe. Please help me!!

Kristoff, what SKU of SQL Server 2005 are you using? Standard, eval, etc? You should be able to go to the start menu and launch /SQL Server Management Studio from there. Are you seeing it there?

Thanks,
Sam Lester (MSFT)