D-Link DAP-1620 Manual page 8

Step 6: If the Network you are trying to extend is security enabled, you will be
prompted to enter its wireless password. Once entered, Click Next
Step 7: Here you can specify what wireless network name your range extender
will broadcast.
- Enter a new network name in the 2.4Ghz Wi-Fi Network Name field
and 5Ghz Wi-Fi Network Name field , then enter a new wireless password in the
Wi-Fi Password field
Note: It is suggested to keep the 2.4 and 5Ghz wireless name different. This will
allow you to easily distinguish between the 2 different wireless signals.