How to use a wifi router as a repeater
If you selected your router's 5GHz network from the list, enter its Wi-Fi password and click or tap Next. Next, you'll be able to customize your range extender's Wi-Fi network names. By default, the range extender will copy the router's Wi-Fi network names and append _EXT and/or _5GEXT at the end. To keep it simple it's best you leave them like