See the overview of Pebbles: Pebbles Overview
2. Pebbles will show the following Welcome message on its channel:
3. Follow the instructions and invite Pebbles to channels where you want to track threads, use the '/invite @Pebbles' command:
4. Continue communicating in threads, Pebbles will notice active threads. Use the '/threads' command in a channel to see which threads Pebbles is tracking. Use menus to set your priorities and sort the list of threads. Click the #number link to open a thread.
5. Click the '...' menu on any thread message to find the 'Manage thread' action:
This will allow you to set the threads subject and priority: