It is really easy.  Just show up a little before show time (earlier if you want a good spot and think it might be busy) and as soon as doors open there will be a person there with your name on a list from TicketWeb.  Then your name will get marked off the list and in you enter the show.

 

If you are over 21 you can come by anytime after 5:00 pm and relax at the bar before the show.  Happy Hour starts at 5:30 pm.   :)