When lying down, push the chassis handle inwards. When you hear a click, it means the reclining position is locked. A friendly reminder: when you lie down to lock the chassis, the gear position may not be the exact one. When you stand up, the backrest may move a little bit. This is normal, so don't worry. Please see the picture in below link for reference, the link is valid in 3 days: https://we.tl/t-SPpgVI3xul
By vevor