If your router and extender use the same WiFi network name (SSID), follow these instructions
mywifiext setup Nighthawk AX8 8-Stream AX6000 Dual Band WiFi-6 Mesh Extender Model EAX80
▪Nighthawk X4 AC2200 Dual-Band WiFi Mesh Extender Model EX7300
▪Nighthawk X4 AC2200 Dual Band WiFi Mesh Extender Model EX7320