Optimize Performance 
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AC750 Wireless Dual Band Gigabit Router R6050 
5.  Click the Set Up QoS Rule button.
Scroll down
6.  Click the Add Priority Rule button. 
7.  In the Priority Category list, select MAC Address.
8.  Select the radio button next to the device that you want to delete.
9.  Click the Delete button.
Note: You cannot delete a device that is detected and automatically added to 
the MAC Device List.
10. Click the Apply button.
The device information is removed from the MAC Device List.