Few things, follow these steps:
Assuming you are using vSZ-H.
Configuration > AP Zones
Select the zone where you want the SSID to reside
Create a Hotspot (WISPr) profile
Creating the WLAN:
When creating the WLAN, use Authentication Type Hotspot (WISPr)
Under Hotspot Portal section, select the Hotpost (WISPr) Portal profile you created
Under this same section, for Authentication Service, enable Use the controller as proxy and select the Local DB option as the authentication server (you could use your radius server if you chose at this point instead of the vSZ as the authenticator).
That's it, the rest is based on your preference. The users you create now under local database will be able to authenticate on these services.