With the Hub, it's just as easy to remove points as it is to add them.
Once you navigate to your member's profile, click on the Activity tab. Then, hover over the line of points you would like to remove.
A Void button will appear at the right. Click this button to remove these points.
If this does not work, or if you need to deduct points for a reason that is not voidable, you can go to the Add Points tab and manually deduct the points using the Misc. points option.
Be sure to include a reason so that the member and other staff users on your team know why the points were deducted.