1)Download boot animation that you desire.
2)Copy it to a folder or root of your SD card.
3)Rename it to,what ever rom you are on,it depends,it can be(bootanimation.zip or spc_bootanimation.zip).
4)Use the file explorer of your choosing,navigate to the folder that contains the boot animation and copy it to(system/customize/resource or data/local).
5)Exit file explorer and reboot,you will now have a new boot ani,enjoy.