How do you get it to recline in the laying position??

The Human Touch PC-075 recliner does not have a stop setting to limit the amount of recline. However, you may be able to adjust the recline tension by using the adjustment knob located under the seat. This will control the ease with which the chair reclines and returns to the upright position.
Adding a mechanical stop to the recline mechanism is not recommended, as it may interfere with the chair's operation and potentially damage the mechanism. It's best to adjust the tension as needed using the adjustment knob.

I take it that it is a house recliner and not a car seat. Turn it on its side and inspect the hinges. They may need a little lube. wd40 is ok. A hinge may be obstructed or bent or have missing parts like a bolt or screw. Sometimes you can make adjustments by loosening and moving the hinges a little.

broken return spring or latch ----

simply lay back in it to push the back rest backwards

Graco states that it is for 6-36 months. It is unclear how far the seats recline (though they are multi-position recline), so if they don't lay flat, it really isn't ideal for newborns.

You must remove the motor, move the seat to the desired position and then reinstall the motor to lock the seat in the position.

A lay flat beach chair is a beach chair that can be reclined to a full position, allowing you to lie down and rest like you're in a bed.

the best thing would be to get the zapp xtra and buy some carrycot adapters
you will then have a safe flat and snug travel system,

Viewed from behind, there are two cords with pull tbs that are gathered together in the center of the seatback with a black plastic gather. These two cords are loosen or tightened to raise or lower the seat back recline position.

On the back of the the seat back is a plastic tab connecting two lanyards/cords. These cords are used to adjust the seatback angle from the recline to full up-right position.