On your iOS device, look for your Settings icon:
Select the icon. In the new window, find the WiFi settings:
Select that. In the new window, find Other: Note: The SSID is called GCS, do not look for or use the old SSID Greenwood.
Select that. Find Security
Select that. You should see this:
Set the Security settings to WPA2 Enterprise, like so:
Then set the Name to GCS and enter your network/wireless username and password.
You can then Join the Wireless. When you do so, for the first time only, you will be asked to accept a certificate:
You should then be successfully joined (See GCS with a check mark, Greenwood is the old SSID):