First, download the updates. 6.0.1 updates can be found here:
http://no.longer.valid/phpwiki/index.php/Downloads.
I find it easier to download them on a Windows PC and cut and paste them to an ibay, so that's what I do.
Then log in to the server as root (either through SSH, or the console), navigate to the folder where you copied the updates, and run these three commands:
rpm -Uvh --replacepkgs *.rpm
/sbin/e-smith/signal-event post-upgrade
/sbin/e-smith/signal-event reboot