You should be able to log into the routers web page by opening Safari and inputing 192.168.0.1
Default log in info for DLink routers are Admin with a blank password so just click the log in button.
Once on the routers web page, select Setup/Wiress settings.
Wireless Network Settings: Enter a fun name for SSID.
Find the Wireless Security Mode section. Select Enable WPA2 Enhanced.
Find the WPA2 section. Select Wireless Security Mode :
Set Cipher Type : AUTO
Set PSK / EAP : PSK
Enter a password in the Passphrase section and confirm it.
The select Save Settings towards the top of the section to apply it.