To get an e-mail notifications on a topic you want to follow, you must preset your Board Preferences:
Select User Control Panel (UCP) under your login name:
In the UCP select Edit notification options and check the appropriate EMAIL check boxes  to get an e-mail notification on a particular event, and more especially the Someone replies to a topic to which you are subscribed option.
To be just kept informed of new notifications when you are logged in, check the NOTIFICATIONS check boxes . The notification will be displayed here as soon as you log in:
Find here a quick answer on how to use the forum [Read only]
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As default, you can also activate the Notify upon replies option, so that when you reply to a post in topic you haven't to subscribe to it, as you will be automatically subscribed to that topic. To do so please select the Board preferences tab in your User Control Panel (UCP) and check Yes as shown below.