I tried to do this too, the stupid website for the metro busses only have PDF files for the schedules.
the browser wont open them. and I gave up becuase I found a much better solution
In google maps (the app on your phone) use the gps to find your location, enter your destination, and set it to use local transit (bus, its an icon next to the walking icon and the car icon where u type in the destination)
and it will show you about 3 or 4 possible routes to get there based on local busses and trains. as long as your in a major city. works PERFECT here in la
it even shows the time each bus is set to arrive and how long each trip is so you can pick a route based on how quick you need to get there
i use this feature ALL the time. the gps even helps you from missing a stop (im prone to that ) haha