Sir I found a iPhone xr i want to remove it iCloud

You can't; it's an anti-theft measure. Take the iPhone to the police, or if applicable, the Lost & Found department of the facility involved.

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If you have found a device, turn it on and see if there's a message. The owner may have done this:

Use the Find My app to locate a missing device or item - Use the Find My app to locate a missing device or item - Apple Support

"What happens if you activate Mark As Lost

...You can also display a custom message with your phone number on the Lock screen, and keep track of your device's location."

For some iPhones see the support article "Return a lost, locked iPhone"; click here --> Return a lost, locked iPhone - Apple Support

Otherwise turn it into authorities responsible for dealing with lost items.

Because it is activation locked you won't be able to use it yourself.