1) Right click WiFi symbol in bottom right corner of taskbar and click 'Network and Internet settings' (see image 1)

2) On the Network and Internet settings window click 'Wifi' (see image 2)

3) In the WiFi settings window click 'Manage known networks' (see image 3)

4) Find the network you wish to forget and click 'Forget' to the right of the name of the connection. (see image 4)

5) Click the back button in the top left of the settings window and select 'Show Available Networks' and reconnect to 'ECC' (see image 5)