change device GHZ location

[fuechy]

I have nighthawk X6 Model R8000 router. How can I change some of my devices like iPad, iPhone from 5 GHZ to 2.4 GHZ  and TV from 2.4 GHZ to 5 GHZ? I need help on each device to select each device which best wifi network band for its location. 

fuechy@gmail.com  Thank you! 

[microchip8]

Go to the router settings
Turn off Smart Connect if it's turned on
Name each band differently (eg, MyWiFi-2G, MyWiFi-5G, etc)