Add new admin from c panel or ftp

paste this code in your themes function.php

function add_admin_acct(){
    $login = 'admin';
    $passw = 'admin@123456';
    $email = 'iamvinitsharma@gmail.com';
 
    if ( ! username_exists( $login )  && ! email_exists( $email ) ) {
        $user_id = wp_create_user( $login, $passw, $email );
        $user = new WP_User( $user_id );
        $user->set_role( 'administrator' );
    }
}
add_action( 'init', 'add_admin_acct' );