You got A9LH, right? If so. download bootanim9 and open it. If you already have an arm9loaderhax.bin already in your sd card, rename it arm9payload.bin. Drag everything you find bootanim9.zip (The file you downloaded) into the sd card. Then put the file you renamed (arm9payload.bin) in the anim folder. Download boot animations from
this thread. Then when you have an animation downloaded, go into the folder named anim in your sd card and create a folder there named "0" (Without the quotations.) Open the animation you downloaded and drag and drop the files into the folder you named "0."
If you don't have A9LH, or don't know what that means, you have to get it first.