Click on the User CP tab at the top of the page. You'll see a list of all your subscribed threads that have unread posts. (including the ones you created). To see all subscribed threads click on View all Subscribed Threads at the bottom of the list.
Also from the User CP page go through all the options in left sidebar, to set things up the way you want.
Just explore, you'll figure out the rest quickly.
If you are using the iPad Forums app, you get to the subscribe threads using the tab at the bottom. Again, explore, it starts to make sense.