On the homepage or other pages, go to the User CP menu. It's on the left side of the page almost at the top. From there you can choose Edit options(on the left side menu) Under the 5th check box you can make a decision about subscriptions that will effect all your posts

You can also go to the same User CP page and choose "List Subscriptions" There you will see all the threads you are subscribed to. You can choose notification for individual thread from that location.
If this doesn't help, maybe Wayne will put a few screen shots up for you.
Do your stuff, Wayne.