The free tickets (you can request up to two) can be obtained here, probably for a few more minutes. The furious act of refreshing the screen and hastily entering your information will only enhance the illusion that you are working very hard!
(The bottom of the ticket)
Just know that you will need to wait on a line in Midtown today, tomorrow, Wednesday, or Thursday, before 3:15 p.m. (you know, like a tourist). Taping starts at 5 p.m.