Where do I meet my Terrapolis contact

Hint 1 of 5:

Enter bathroom to right of screen center.

Hint 2 of 5:

Enter stall on left side of screen.

Hint 3 of 5:

You can get instructions or not.

Hint 4 of 5:

Credit is only good for phones, Bizzy, or at the cafeteria.

Hint 5 of 5:

It can be exchanged for Krells at the Exchange Center.