Edimax BR‐6428nS V2 User Manual page 21

In Range Extender mode, the BR‐6428nS V2/nC's default SSID is
your existing router/access point's SSID + _2EX. For example if
your router's SSID is "Your SSID" then the BR‐6428nS V2/nC's SSID
will be "Your SSID_2EX". You can change the BR‐6428nS V2/nC'S
SSID in the "Device SSID" field.
To connect to a hidden SSID, check the "Setup extender manually"
box and enter the SSID, device SSID and encryption information.
17