In theory you would just click on 'Thread Tools' and select to 'Subscribe' but I have not been able to get it to work.
On trick in such cases is to change your account email address if you have more than one address. Some email providers will block such email notifications.
You should also check your junk folder as such notifications are often seen as junk.
Sorry that I can't give anything more definitive but I haven't really tried much with it. Since I'm a moderator I log in probably at least 4 times a day on average and just go to 'New Posts'. Mayhaps your query will intice me to look at it a bit more...