Asus RT-AC66U User Manual page 58

NOTE: In Hybrid mode, wireless devices connected to the ASUS wireless
router will only receive half the connection speed of the Access Point.
4. In the Connect to APs in list field, click Yes if you want to
connect to an Access Point listed in the Remote AP List.
5. In the Control Channel field, select the operating channel
for the wireless bridge. Select Auto to allow the router to
automatically select the channel with the least amount of
interference.
NOTE: Channel availability varies per country or region.
6. On the Remote AP List, key in a MAC address and click the Add
button
Points.
NOTE: Any Access Point added to the list should be on the same Control
Channel as the ASUS wireless router.
7. Click Apply.

to enter the MAC address of other available Access