Date selection
In version 3.3 the date selection control changed. You will notice this on the Billing and Scheduler screens.
Select a date range
First, click the beginning day of the custom date range you would like

Next, click the ending date of the custom date range

This will highlight all the days between the two dates.

You can change the months (forward/backwards) by clicking the arrow icons.

Click the apply button to use that range

The dates you selected will be included in the range.
Select a pre-defined date range

From the left menu, click on one of the pre-defined date ranges. This will highlight the days in the calendar.

For example, clicking "Next Week" will highlight the days in the calendar that are for next week. Click the apply button to select the date range once finished.