This document will guide you how to configure Local Anti-Passback zone which is provided without license.

Local zone means RS-485 based, master device is zone master. Please refer to the below link for RS-485 configuration. 
RS485 Mode (Master, Default, Slave) 

Go to Device tap, click Add Door and configure the door which you want to set up Anti-Passback zone.
 

Assign each Entry device and Exit device to the devices you have already added at the above step. (RS-485 Master and Slave devices)

Once you assigned Entry Device and Exit Device, Anti-Passback and Alarm menu will be added at the bottom.