Here's a quick tutorial on how to subscribe to a specific trail. If you are a builder/maintainer of a trail, subscribing is especially useful as anyone subscribed to a trail will receive an email when a report is added or an edit is made to that particular trail.
To subscribe to a trail, scroll to the bottom of a trail's detail page, and click the "subscribe" button.
Then, choose which actions you want to be notified for, including granular trail report options.
For a detailed tutorial, please view this video.