how to enable selinux in kernel

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http://serverfault.com – I am working with the Linux -64 AMI on AWS. I am trying to get my mail server running on the box. In an attempt to turn on SELinux I did Edited /boot/grub/grub.conf and added selinux=1 to the end of the kernel statement Then touch /.autorelabel And then rebooted. Upon reboot I web browse to my website and I get a server access error saying I can not access / Of course I do not want to be at the root. What has gone wrong here? How can I get SELinux enabled so I can run a mail server? (HowTos)