Using the Camera Butter Shock Mod ND Filter is easy. First, remove the existing lens or cover from your GoPro. Twist it 90 degrees parallel to the camera, and you can pull it away slightly if needed. Next, take off the protective stickers on the front and back of the filter. Place the filter on the camera with the metal bars on the filter horizontal. While pushing it down towards the camera, twist it 90 degrees until it sits square on the GoPro and the Camera Butter Logo is at the top. Make sure it's properly seated and flush with the camera. If it's crooked or loose, take it off and reinstall. For maintenance, since the filter is nano - coated, you can easily wipe off water, oils, and dirt. Just use a soft cloth. Also, be careful when handling it to avoid scratching the glass. Remember, the GoPro Hero 13 doesn't support auto lens detect correctly with an ND64, but it will still function okay, showing as an ND32.