If you have registered as a member of the Thorn Tree forum you're able to create watches (updates) of threads (discussions). It's really easy to create a watch.

Step 1: Make sure you're signed into your profile.

Step 2: Go to the thread you want to watch.

Step 3: Click on the button with the eye on it.

Once you're watching the thread you can adjust your watch settings. Within your profile settings is the option to adjust how you're updated about the threads you watch. You can chose to always watch topics you create, always watch topics you post to, and within the settings you can edit or remove watches.