Help me create another iCloud for this phone

Before signing out Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support the existing apple id from the iPhone make sure you have correct credentials of the account written in your diary ( like three correct answers for security questions , date of birth , rescue mail address and its password , credit card details optional if added ) .

Then follow the article How to create a new Apple ID - Apple Support

Note : the method applies when an Apple ID is already signed in iPhone .