Student or Learner
I want to know whether I can make the forum tell me (by sending an e-mail) whenever my threads have new posts in them, and how.
As Hiccup says, yes indeed you can! This process is called subscription, and you can find further information about creating and managing your subscriptions in our forum FAQ here: UsingEnglish.com ESL Forum - FAQ: User Profile Features
I'm not a teacher, so please consider any advice I give in that context.