Where are you stuck? You need to setup the radius auth and accounting servers, create a hotspot service, plug your captive portal URL in, select the radius servers you created and then assign the hotspot service to a new WLAN. At least that's the really short version... Are you on a ZD or Unleashed?
Also it wouldn't hurt to nag the IronWifi people - they have guides for other manufacturers, just not Ruckus. Let them support you, they're pretty helpful. I even sent them a bunch of screenshots, so they can at least see what the UI looks like.