I have no password and account of the i-cloud on my second hand iPhone

Change Apple ID or password existing on a second hand iOS device?

You need to sign out using the current credentials, then you can create a new Apple ID & Password.

If you don't know those credentials, that device is "activation locked" (an anti-theft measure), neither we, just users like you, nor Apple can help you, unless you are the original owner and you still have the proof of purchase (receipt/invoice reporting your device’s IMEI or Serial Number). Should be this case, start your request using this link: https://al-support.apple.com/#/additional-support

Shouldn’t be this case, activation lock can be removed only by the previous owner, with the credentials that were used to activate that iPhone/iPad. Without those credentials, that device is useless to you.

You can also take a look at this support article:--> How to remove Activation Lock - Apple Support

Regards

Giulio

If you are getting an Activation Lock message the phone will be forever unusable→The All Too Common SAD Reality of Buying a Used iPad/iPhone