How to setup automatic updates to go to all PC’s without going to each PC

How do I setup automatic updates to occur and download to all PC’s in my network without going to each PC and using the gpedit.msc command to setup a policy. I just installed my WSUS server on a Windows 2003 server. Now I want to push the downloads to each PC. I read instructions to go to the WIN XP PC and setup the automatic updates but I cannot go to all PC”s to do this. Please help, I am new at this.