send email when ever i creat account in visualforce ui interface there is an ENTER EMAIL :_______ field in this field i enter email send that particular person

Create a trigger :-

trigger SendEmailTulasi on Account (after insert) {
    for(Account a:trigger.new){
            Messaging.SingleEmailMessage msg = new Messaging.SingleEmailMessage();
            String[] cc = new String[]{a.Email__c};
                msg.setToAddresses(cc);
            String body = 'Dear Customer hope you are well';
            msg.setPlainTextBody(body);
            msg.setSubject('test email');
            Messaging.Email[] emails = new Messaging.Email[]{msg};
                Messaging.sendEmail(emails);
    }
}

Kindly mark it as the best answer if it works for you.

Thanks & Regards,

Priya Ranjan