I created a URL in my browser tool bar for all XenForo-based sites to take me directly to unread posts. This is the URL I use for the FOG:
https://festoolownersgroup.com/whats-new/posts
The software will append a number on the end of the URL that is similar to a time stamp for your specific viewing session. If you click on the "Mark forums read" icon in the upper right corner, any new posts made since you started viewing will not be marked as read. The actual URL will look similar to this and the number will change with each new post session:
https://festoolownersgroup.com/whats-new/posts/120