Edimax EW-7478AC User Manual page 16

3.
Select whether to enable Cross Band technology. This can help to
maintain your router's maximum speed capacity as the Wi-Fi signal is
extended.
4.
Select the Wi-Fi network name (SSID) which you wish to connect to for the
specified frequency and click "Next" to continue.
If the Wi-Fi network you wish to connect to does not appear, try
clicking "Refresh".
To connect to a hidden SSID, check the "Setup extender manually"
box and enter the details manually on the next page, as shown
below.