From here, you can set the recurrence pattern of the Schedule. For example, if you want the Task to recur on a daily basis from Monday to Sunday, simply select the Daily option. However, if you click Weekly or Monthly, you will then be able to select specific days and dates, and define whether the Task takes place every week/month, or every two/three/(etc) weeks/months.
For example, if you want to schedule a Task for every second Monday, select the Weekly option, select Monday, and change the Recur Every dropdown option to 2.