Set up access rules and Multiple SSIDs for your WLAN.
An access rule is bound to the MAC address of the device. This helps you to seal off your WLAN against unknown WLAN devices.
The SSID is name of your WLAN. Do not use standard term, e.g. D-Link WLAN, as SSID.
The ${_global.productname} supports Multiple SSIDs so you can operate several WLANs in parallel.