To replace a Graco car seat cover, locate the user manual for specific instructions. Ensure that the cover is compatible with your car seat model. Remove the existing cover and align the new one carefully. Secure it by fastening the straps, buckles, or hooks as per the manual. Double-check the cover’s fit to ensure it fits snugly and does not obstruct the seat’s safety features. Remember to refer to car seat safety regulations for proper installation and use.