D-Link AC3150 User Manual page 96

Section 4 - Configuration
Visibility Status:
The default setting is Visible. Select Invisible if you do not want to
broadcast the SSID of your wireless network.
Schedule:
Use the drop-down menu to select the time schedule that the rule
will be enabled on. The schedule may be set to Always Enable, or
you can create your own schedules in the Schedules section (refer
to page 111).
Click Save when you are done.
D-Link DIR-885L User Manual 92