Babys head keeps dropping in Car seat

🐧🌻 Erin🍍🦄

I am literally afraid to go anywhere because of this and we are moving to New York in a few months which is a 20 hour drive., How do I fix this? I have the baby trend EZ 5 car seat and every time my baby is in it her head drops down. Is this because the car seat isn't in the right position and if so how do I fix it? The user manual is extremely confusing.