Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 106)

ADSL2/2+ Router
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Disabled: Select it to disable MAC filter function.
Allow: only allows clients in the MAC address list to access your
wireless network.
Deny: only prohibits clients in the MAC address list from accessing
your wireless network.
Add: to add a MAC address, click the “Add” button.
To delete an added MAC address, first check the “Remove” box behind
the MAC address in list and then click the “Remove” button.
Example 1: If you want to allow the PC with MAC address of
00:1A:3D:9C: BB: 23 only to access your wireless network, then follow
the instructions below:
Click the “Add” button in the above screen to enter the page below and
enter the MAC address 00:1A:3D:9C: BB: 23 in the text box as shown
in the below figure: