Notifications for a specific thread/topic
You'll see these tabs/options above the name of the thread
Go / New / Find / Notify / Tools / Reply
Click on Notify
You can also get notified of any new post from a specific member.
I find it easiest to click on the members name. You'll get a drop down box. Click on "Notify me of New Posts by [member name]"
If you can't find the notify tab, do a CTL+F and use the find function. Search for Notify. The tab will be highlighted.