How do I add new users to the "Watch List" for a particular bug in Redmine so that they will get updates for changes to said bug?
If you are in the process of creating a bug, you can scroll down to the bottom of the "New Issue" section, and select the watchers there. This method will also ensure they are emailed about the creation of the bug. IIRC, adding them after the fact doesn't result in their being emailed until an actual change is made to the bug's status.