TD-W8970N 
Wireless N ADSL2+ Modem Router User Guide
Figure
¾Remove: Select the check box in the table on the screen above and then click the Remove button, the corresponding interface will be deleted in the table.
)Note:
If the interface is used by the configuration of the 4.4.2 WAN Service, you need to remove the corresponding WAN Service entry first before you can remove it here.
¾Add: Click the button, and you can add a new interface in the next screen.
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