Ending a season will clear your roster which would result in you having to re-add your roster for your new season. You will be able to view all stats for the season you are ending whenever you want by changing the current season. Learn how to view a different season here.
End your Season
1. Go to the Main Team page in HoopMetrics
2. Select "View Full Profile"
3. Go to the team's Settings page in the bottom right corner
4. Select End Season