This feature will allow you to check the top 10 forum threads over a specific period of time.
Access the Forum Top Posts:
- Go to Members Area, then select the Forum.
- Click on the ellipsis or 3 dots (…) on the upper right hand corner and then select Top Posts.
The Top 10 Posts (Most Engaged) window will pop up.
Top 10 Posts (Most Engaged) window 
Date Range
This will allow you to choose the start date and end date you want to display the top posts. 
Top Post list
This will show the list of the Top 10 posts or threads.
Clicking a thread in the list will launch the thread in a new tab.