Arduino-SL030-MarcBoon RFIDuino

I have been trying to interface SL030 with arduino uno with the help of MarcBoon RFIDuino [GitHub - marcboon/RFIDuino: Using RFID readers with Arduino] library. The reader is successfully reading and writing on tags but the problem that i am facing is in authentication.
I don't know how to authenticate and login a particular sector in RFID tags and read its content.