I'd recommend ignoring the kernel patch and just downloading the full new kernel.
www.kernel.org
will help you there.
To compile the kernel:
http://www.linux.org/docs/ldp/howto/Kernel-HOWTO/
It also explains how to patch it up, but since that will require recompilation anyway anyway I'd suggest recompiling from the full kernel. Patching increases your chances of making a mistake and spending the next few days figuring out what happened and why it crashes.
update kernel patch
