D-Link AC1750 Guide D'installation Rapide page 11

If you clicked "Extend an existing wireless network"
A list of detected wireless networks within range of the DAP-1720 will
8
appear. Click on the network you want to extend. If you want to manually
type in the Wi-Fi network name (SSID), click Manual at the bottom.
9
If your wireless network is secure/encrypted, enter the Wi-Fi password and
click Next to continue.
If you clicked Manual, enter the SSID and security information (Wi-Fi
password) of the wireless network you want to extend and click Next to
continue.
DAP-1720 Install Guide
Skip to page 12 to continue
9