Ok, i was thinking that there should be the option to get notifications (on the tab in forums). Just whenever your thread or a thread you replied to gets another reply. I know you can see on the front page, but it will be a fast way to reply to a post. And it will get to your attention when you see a (1) next to notifications.
Just click on "Settings" and it will show you, also that is more of a Vbulletin thing, the Devs here do not code the website.