Can’t get it to work

I got this for my son for his phone as he is always breaking his cables and his phone is always on life support. I thought this would be great for him. Unfortunately I can’t get it to charge his phone. I’m not sure if I need to take the case off or not. Which I don’t want to have to take the case off every time I have to charge his phone. Unfortunately the directions I got are in another language and I only speak and read English. I’m sure this would be a fantastic item for someone else but unfortunately for me I can’t get it to work. So it’s just sitting in the box in our junk draw/gift draw.