Connect to ntu-wifi from your list of wireless networks
Enter your NTU username and password
Verify the certificate you are presented with, this will be the same as the image below (Show Certificate)
Confirm the certificate settings with your Mac’s admin account and password.
After this you will be connected to ntu-wifi.
To forget and remove the saved password
1. Select the WiFi icon on the top bar and then Open Network Preferences
2. Select Advanced
3. Select NTU-Wifi in the list and then click the minus sign and then OK.
4. Select the WiFi icon again and choose NTU-Wifi when prompted enter your NTU username and new password.