Hello Mark
First Step :
be sure that your VLAN Guest is propagated proprely on all interco ports + AP ports (if any)
Second step :
Create your Guest SSID
Association requirements: Open
Splash page Sign-on with : My RADIUS Server
RADIUS for splash page : Put C4W Radius Servers (1812 Port Auth and 1813 for Accounting)
configure walled garden
Addressing and traffic : Bridge mode + TAG the vlan ID (if any)
then
go to Wireless => Splash Page :
Custom Splash URL : Or provide a URL where users will be redirected : put your C4W Splashportal URL
Splash Behavior A different URL : put your C4W Splashportal URL