You have the option to watch any thread you like and to receive emails when there are new posts in that thread also. To do this go to the thread you want to watch and click on Watch Thread in the top right of the thread. You will get this pop-up asking if you want to receive email notifications if someone posts in that thread from now onwards.
To view all your watched threads just simply go to your Name at the top of the page and click on watched threads. This will take you to a page that will show your watched threads if they have new posts in them. To view that thread just click on it.