Not sure where you need a subscription for, but you should have two options. Either go to the episode when it just is going to air and there should be the option to watch it live. Or, you could wait an hour or so and you should just be able to download the episode after it aired, which is what I do.
EDIT: I don't have used the iPad app, but I assume it works the same.
EDIT 2: Apparently you can also use the channels, and if it is on a program that is allowed to be streamed online it has watch live for me. So cycle through the channels, see if you get something.