how to remove icloud account from iphone 5s ....

Just simply sign out from the iCloud account in iphone

What if you want to remove it from a stolen device?

CBrizzy wrote:

What if you want to remove it from a stolen device?

You can't. That's the whole point of Activation Lock; it renders a stolen device permanently useless. And hackers have been looking for a way to bypass it for 3 years, without success.