D-Link DAP-1620 Quick Install Manual page 10

If you clicked "Extend an existing wireless network"
A list of detected wireless networks within range of the DAP-1620 will
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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.
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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.
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Skip to page 12 to continue
DAP-1620 Install Guide