Then you have no problems, there are boot animations ALL OVER this forum and similar forums. Choose the one you like, download the zip file - make sure you name it bootanimation.zip (exactly like I typed it). Copy it, via USB, to either data/local (preferred) or system/media on your SD card. reboot and you'll have the boot animation. It's easy as pie.
The one I had was called "Boot Animation Changer (Root)" by Crotalusfreak. It shows up under my apps as being purchased but it says it doesnt exist in the market anymore, maybe because Im on gingerbread.