External Captive Portal with fortigate

I working on external captive portal and every things go fine 

I followed this tutorial to configure my fortigate 

http://cookbook.fortinet.com/using-an-external-captive-portal-for-wifi-security/

I making 2 policy for it 

but when one user is authenticated all another users can access internet 

I know my problem is I don't make example-wifi-net as in the tutorial because they don't talking any thing about this address I don't know what is this address  . please help me