I installed my Graco SnugRide 30 Click Connect car seat today, which was fairly simple. However, it has this sticker on it, and it says it has to be level to the ground. I'm just a little confused since the car seat is obviously on the seat... How do I know if it's leveled or not? I've seen others with a liquid type leveler that seems so much easier. 🙈 Sorry, FTM here & I just want to make sure the car seat is installed properly. Thank you in advance!