In this dialogue you can set the motion settings.

Motion detection enabled

Whether motion detection is allowed on this camera, see Options ~ Motion. The sensitivity slider can be used to change the motion detection sensitivity - a low value (moved to the left) is a low sensitivity which means a large motion will be needed to trigger, while a high sensitivity value (to the right) only needs small changes to trigger motion.

Email motion detection notifications

If this is selected then when a camera is triggered by motion detection an email will be sent to the email address entered.