Using your K&N Universal Air Filter is easy. First, find the right filter for your equipment based on the air intake's specifications. Then, attach the filter to the air intake. The rubber flange can be stretched a bit if needed to get a proper fit. When it comes to maintenance, clean the filter regularly. You can wash it with a mild cleaner and let it dry completely before reinstalling. Make sure to check the flange for any signs of wear and tear. If you notice any damage, it might be time to replace the filter. Also, always follow the manufacturer's guidelines for your specific equipment when using the filter.