Hello, I want to unlock the icloud, but I forgot the email and the password and I want to format it from one device to the other

There is no “unlock iCloud”, there is an Apple ID, and each of which has associated storage in iCloud.

You are seemingly here encountering Activation Lock. Activation Lock is intended as a theft deterrent.

To clear an Activation Lock, you will need the password of the associated Apple ID, or the original purchase receipt and matching photo ID and a discussion with Apple Support. If this device was recently purchased and the seller is still available, contact the seller for remediation or for refund. A remote unlock using iCloud is available to the person with the Apple ID holding an Activation Lock, if they’re inclined to unlock this device.

If you forgot your Apple ID password - Apple Support

If you forgot your Apple ID - Apple Support

How to use account recovery when you can’t reset your Apple ID password - Apple Support

How to request access to a deceased family member's Apple accounts - Apple Support

Contact Apple for help with Apple ID account security - Apple Support

Again, Activation Lock is a theft deterrent mechanism. A theft deterrent that is easy to bypass would not be much of a deterrent. No, nobody here in the Apple discussion forums can help you clear Activation Lock. Only the previous owner, or Apple, can clear this lock. For Apple to clear the lock, you will have to provide a receipt with proof of original purchase and with matching serial number, and provide matching personal identification, or similar materials.

And as purchasing devices with Activation Lock is far too common, also see the following:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

To reset and reload an iPhone, iPad, or iPod touch, you will need a Mac running macOS, or a computer running Microsoft Windows, or a trusted associate with either, or the assistance of Apple or an Apple authorized repair provider. There is no means to reset using another iPhone, iPad, or iPod touch. It is possible to erase contents using iCloud, but this does not reload the contents.

tewdros50 wrote:

Remove my iCloud

There is no “remove iCloud”, there is an Apple ID, and each of which has associated storage in iCloud.

You are seemingly here encountering Activation Lock. Activation Lock is intended as a theft deterrent.

To clear an Activation Lock, you will need the password of the associated Apple ID, or the original purchase receipt and matching photo ID and a discussion with Apple Support. If this device was recently purchased and the seller is still available, contact the seller for remediation or for refund. A remote unlock using iCloud is available to the person with the Apple ID holding an Activation Lock, if they’re inclined to unlock this device.

If you forgot your Apple ID password - Apple Support

If you forgot your Apple ID - Apple Support

How to use account recovery when you can’t reset your Apple ID password - Apple Support

How to request access to a deceased family member's Apple accounts - Apple Support

Contact Apple for help with Apple ID account security - Apple Support

Again, Activation Lock is a theft deterrent mechanism. A theft deterrent that is easy to bypass would not be much of a deterrent. No, nobody here in the Apple discussion forums can help you clear Activation Lock. Only the previous owner, or Apple, can clear this lock. For Apple to clear the lock, you will have to provide a receipt with proof of original purchase and with matching serial number, and provide matching personal identification, or similar materials.

And as purchasing devices with Activation Lock is far too common, also see the following:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

To reset and reload an iPhone, iPad, or iPod touch, you will need a Mac running macOS, or a computer running Microsoft Windows, or a trusted associate with either, or the assistance of Apple or an Apple authorized repair provider. There is no means to reset using another iPhone, iPad, or iPod touch. It is possible to erase contents using iCloud, but this does not reload the contents.

Remove my iCloud