First, configure the alerts you want. Edit your camera, check the box for 'Start actions when motion is detected' and select 'Video Recording', 'Take Photo', and 'Email Notifications', click OK. Next, click Tools >> Scheduler and add a new schedule, select the Monitoring with Alerts box and set the start and end time you would like. Finally, since you would like to perform this twice per day, add a another entry in the scheduler with the second start and end times you want.

More scheduler information can be found here.