Okay first of all I am going to assume that you have CWM flashed and an unlocked bootloader.
1. You have to download the file and push it to your sdcard.
2. Reboot into recovery via adb or rebooter app
3. Make a nandroid backup (takes a while but worth it incase you screw up)
4. Once done go to install zip and navigate to sdcard where you pushed the zip file and select it.
5. Once it finishes flashing it is obligatory to wipe data/cache as well as dalvik cache (which is found on the advanced tab)
6. Now you can reboot and enjoy your rom (first boot always takes longer than the others due to wiping dalvik)
I am not responsible if you end up screwing up your device.