D-Link DCH-S150 User Manual page 21

Section 3 - Usage
Tapping Customize Rule will take you to the Details page where
you can select different days and times that the device will be
active in a table. Simply tap and drag the bars in the table to
adjust the times. Tap x to delete a specific time.
After the schedule is set, go back to the previous page and tick
the radio button next to the rule to activate it.
D-Link DCH-S150 User Manual 18