Delete iCloud

Hello abdulrahman269 and welcome to Apple Support Communities.

It appears you are trying to use a device that is already signed in to an Apple ID, possibly the ID of the former owner.

In order to remove the Apple ID from the device, the previous owner will need to sign in to their account. If you If you can contact the former owner, they can remove the iCloud ID directly on the device by tapping Settings > Their Name > Sign Out at the bottom. They may be asked to enter their password. If you can't have the previous owner do this in person, they can sign in to the iCloud website from a computer and remove the device from their account by following these steps:

"If the previous owner isn't with you

If the previous owner isn't present, contact them and ask them to follow these steps:

1. Sign in to iCloud.com with their Apple ID.
2. Go to Find My iPhone.
3. Click All Devices at the top of the screen.
4. Select the device that you want to remove from iCloud.
5. If necessary, click Erase [device].
6. Click Remove from Account.

After the previous owner removes the device from their account, turn off the device and then turn it back on to begin the setup process."

Turn off Find My iPhone Activation Lock

Cheers!