D-Link AC750 User Manual page 185

Section 5 - Connect a Wireless Client
7. The following window appears while the router is being configured.
Wait for the configuration to complete.
8. The following window informs you that WPS on the router has
been setup successfully.
Make a note of the security key as you may need to provide this
security key if adding an older wireless device to the network in
the future.
9. Click Close to complete WPS setup.
D-Link DIR-818LW User Manual 180