How do i turn off Find My Iphone without the phone and not knowing password to icloud account?

I no longer have any Apple products. I have a phone that is an Android and computer lap top that is a Dell

You can reset the password of your iCloud account at https://iforgot.apple.com/password/verify/appleid

Other than that, you can't. If you're unable to reset your password and don't have the device then how do you prove that it is your device and not stolen?

Without access to the iCloud account or ability to reset the password of the account, there's nothing you can do about it.