After you enter the basic data for the rentals you should be asked questions about each property's PAL for both regular tax and AMT. That's where it is entered - not directly on the 8582 which if left would prevent e-filing.
go back to the rental section and go from screen to screen until you hit the questions. if you are using a desktop version you can switch to forms mode and then on the worksheet for that property towards the bottom is the place to enter the PALthis.