EnGenius ESR1221N User Manual page 54

Add PC MAC Address
Fill in "LAN MAC Address" and <Description> of the PC that is allowed
/ denied to access the Internet, and then click <Add>. If you find any typo
before adding it and want to retype again, just click <Reset> and the fields
will be cleared.
Remove PC MAC Address
If you want to remove some PC from the "MAC Filtering Table", select
the PC you want to remove in the table and then click <Delete Selected>.
If you want to remove all PCs from the table, just click the <Delete All>
button. If you want to clear the selection and re-select again, just click
<Reset>.
Click <Apply> at the bottom of the screen to save the above configurations.
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