@Chloe1968

You need to subscribe to the thread in question, then you can get emails each time someone posts a reply.

Go to "Thread Tools" on top on the thread (on top / to the right of our initial post)
Then select "Subscribe to this thread"
Finally choose the option you prefer (i.e. instant notification, daily updates etc.)

This way, you will get notified each time somebody adds a reply to any thread you subscribe to.