how do you turn on the bright light in cellar

how do you turn on the bright light in the cellar .got all the keys and can't figure it out

All ya gotta do is click on the key on the door.

first, get a key and put it on the little black screen (at the top center of the sreen) and it will show you a letter, so you have to push the button for that key and turn the other button (just at the low center of the screen) and select the letter. Once you finish with the 7 letters, the door will open.

I have put the keys on the center screen and matched them. The door did not open.