In the lobby on the first floor, on the stairs. It's conspicuous. You can see it when you go. I need to register my ID card, so I'm usually busy. It is not recommended that you use it, hehe, unless you go early. You don't need a card, you need a self-study card. It's free.

Every time I go at noon or afternoon, I open the door. There are many people in it. Ha ha. You can go after noon 1.

Good luck O(∩_∩)O~