Tenda A18 User Manual page 19

You can connect your wired devices to the LAN port of the repeater, or connect your WiFi devices
to the extended network to access the internet.
SSID of the extended network: your existing WiFi network with a suffix _EXT or
−
_5GEXT.
WiFi password of the extended network: the same as the existing router.
−
If you want to modify the repeater's SSID and WiFi password later, refer to
password.
13
Changing SSID & WiFi