ok, After creating your Guest VNS through the VNS Wizard, GO to WLAN Services and select your newly created Guest VNS.
The go to tab Auth & Acct
Change the drop down box from "Guest Portal" to "Guest Splash"
Then Click Configure
Then click "Launch Captive Portal Editor"
Create your Splash and Message
Click Save and Close
Then click close on the next window
Then Click save in the last window
Your Splash can look however you want to configure it, This one is just for this demo for you
If you have any other questions or run into an issue, please do not hesitate to let us know and we will get you where you want to be