To configure 5G network on my RE6300 linksys range extender, first you need to find out the IP address of the router.Then open the IP address on the browser.When you see the login page, you need to enter the credential to log in.After you are logged in , check for the devices connected,Now out of that select on the one that's for extender's network.Click on that and check the IP address of the extender.Now open the IP address on the browser,login to the sign in page first,then goto the wireless settings.Change the 5GHz settings.Create the new password and save the settings.Let the extender reboot. It's all set now.
Please follow these steps that help you to configure your 5Ghz band of your linksys devices :-
You need to find out the IP address of your router and then put that IP address on the top of your address bar and then hit enter . Your will see login screen where you need to login through your username and password.
Once you log in into the router then look for connected devices, in the connected devices you will see you linksys extender , please click on that and you will see IP address of your extender .
Once you get the IP address of your extender put that IP address on the top of your address bar and hit enter. you will see login page of your extender where you need to sign up first .
Once you sign in then go to wireless setting and change the 5Ghz band setting , create a password for you 5Ghz band and save the setting . Then extender will applied that setting and reboot once the you will see your 5Ghz band on your wifi .
Connect you devices now with 5Ghz band and put you password over there and once it connect. you good to go.