Access the "Playbill Broadway Rush, Lottery and Standing Room Only Policies" website. It contains a list of current plays that are offering discount tickets. Most of the plays are major Broadway performances for which you can get good seats for less than $40.
Choose a play you want to see. Follow the directions on the website for the play you have selected. For example, if you chose the "Addam's Family," you have to be a student to get a discounted ticket, which is around $40. Not all theaters have this policy. Some offer tickets to the public at similar discounts for good seats and some host lotteries.
Type in the name of the play in the search box to get more information about it. For example, if you type in "Addams Family" into the search box, a list of links will come up. The first link will usually give you more information about the discount tickets, and the showtimes.
Go to the box office of the theater the show is playing at the time specified on the Playbill website. For example, the showtimes and theater location for the Addams Family are given on the "Addams Family Playbill" website. Its website says that you should be at the theater two hours before the show begins. Also on that website are the times and performances the discounts are offered.
Follow the directions the host of the lottery or the person at the box office gives you for participating in the lottery or for getting a discounted ticket.