How to turn on device location remotely with icloud?

You cannot turn on Find My remotely. It must be done on the device. If you did not have Find My turned on, there would be no way for you to locate your device.

For more information about Find My:

Find your lost iPhone or iPad with Find My - Apple Support

Using Find My to locate missing Apple devices - Apple Support

You enabled Find My on the phone.....before it was lost, correct?

"Offline" simply means that one or more of the following is true:

1) The phone is not powered on

2) The battery has run down

3) The phone does not have an Internet connection where it is located

Unfortunately, there is not really anything that you can do about this other than check a few times each day to see if the status of the phone has changed.

Please be aware that thieves are very fond of placing stolen phones in a special type of bag that will not allow the phone to either send or receive any signals. The phone will also display as "Offline" in this case, so this may be a factor here as well.

I want to turn on my location on another device

I want to turn on my location on another device

If you are asking about remotely turning it on, you will need to read the thread. If it is something else, please provide more details.