you can find the MAC address of the label which is on the bottom of the 701ND.
or you can find it on the webpage 192.168.1.254

hi helper

I hope I understand your question perfectly.
1.) Sandy is correct. The MAC address of the router is printed underneath the router's sticker.
I think the MAC address is fixed, it cannot be changed.
2.) If you have MAC filtering enabled on your router, you also need to setup MAC filtering on the
TL-WA701ND as well and set it up as an access point mode and connect it to your main router's
LAN port via an ethernet connection.

I hope this help. Good luck.