How Do I Set Up Qos Quality Of Service Settings On My Router

I came to know that through QoS settings one can give preference to certain IPs ,MAC addresses or even reduce priority of certain ports.I basically want to know how the settings are done . I’m posting the link below

https://docs.google.com/open?id=0B8kDPoZanrYoYUZqMDUzajhJMlU