How do I

Lady: I need to look up some stuff on the computer.
*We both glance at the sign that says COMPUTER SIGN-IN AT CHECKOUT DESK*
Me: You can do that at the checkout desk.
Lady: How do I do that?
(Turn 180 degrees, put one foot in front of the other, and walk to the checkout desk!)
Me: Just show them your library card, and they'll give you a computer pass.
Lady: Cool! *walks to circ desk*