D-Link AC750 User Manual page 28

Section 3 - Configuration
7. You can now use the mydlink SharePort™ app interface to
stream media and access files stored on your removable drive.
The wireless icon at the bottom will be lit blue to indicate
a Local Access connection. It will be green to indicate you
are connected to the router through Remote Access.
Note: If you see a red wireless icon, your router's network environment may not
be suitable for a direct network connection and you may experience slow
network speeds.
D-Link DIR-816L User Manual 23