Create a Flow Sensor (Cisco WLC Controller) or a Meraki sensor from Sensors -> Add Sensor
Fill the SNMP Community if you want to scan and add access points automaticaly
Check Active Radius and choose a Radius secret. The secret will be used later on the WLC or Meraki.
Expand Captive Portal section and fill the settings, then press on Update to save configuration.
Once save the sensor pressing Update, go again to same edit view of the sensor right top click con View Acesss Points. Then click on the right top corner Options and Scan Access Points.
The system will scan via SNMP the WlC or Meraki and add the Acceess Points automaticaly.
You can also add the Access Points in a manually at the bottom.