How do I operate the upper elevator

Hint 1 of 7:

There's a slot.

Hint 2 of 7:

It's made for cards.

Hint 3 of 7:

Like upper elevator access cards. (See "General Questions" for place)

Hint 4 of 7:

Slide it through the slot.

Hint 5 of 7:

Press either the up or down button.