WordPress Admin via FTP

    Log in to your FTP
    Create a new file in your computer (or server) and name it adduser.php
    Paste this code here below inside the file
    Change the username, password and email inside the file
    Save the file
    Go to your site and add /adduser-php to the URL. For example https://yoursite.com/adduser.php
    If everything is configured correctly then you’ll see the “Successfully created new admin user. Now delete this file” notification
    Now go back to the FTP and delete the adduser.php file
    Log in to your site by using these new credentials



<?php
// ADD NEW ADMIN USER TO WORDPRESS
// ----------------------------------
// Put this file in your WordPress root directory and run it from your browser.
// Delete it when you're done.

require_once('wp-blog-header.php');
require_once('wp-includes/registration.php');

// ----------------------------------------------------
// CONFIG VARIABLES
// Make sure that you set these before running the file.
$newusername = 'username'; // here goes your username
$newpassword = 'password'; // here goes your password
$newemail = '[email protected]'; // here goes your email
// ----------------------------------------------------

// This is just a security precaution, to make sure the above "Config Variables"
// have been changed from their default values.
if ( $newpassword != 'YOURPASSWORD' &&
     $newemail != '[email protected]' &&
     $newusername !='YOURUSERNAME' )
{
    // Check that user doesn't already exist
    if ( !username_exists($newusername) && !email_exists($newemail) )
    {
        // Create user and set role to administrator
        $user_id = wp_create_user( $newusername, $newpassword, $newemail);
        if ( is_int($user_id) )
        {
            $wp_user_object = new WP_User($user_id);
            $wp_user_object->set_role('administrator');
            echo 'Successfully created new admin user. Now delete this file!';
        }
        else {
            echo 'Error with wp_insert_user. No users were created.';
        }
    }
    else {
        echo 'This user or email already exists. Nothing was done.';
    }
}
else {
    echo 'Whoops, looks like you did not set a password, username, or email';
    echo 'before running the script. Set these variables and try again.';
}

Option 2: add new user by modifying a functions.php file

    Log in to your FTP
    Go to the wp-content >> themes >> your theme and open functions.php.file
    Paste this code shown below inside the functions-php file
    Change the username, password and email inside the file
    Save the file
    Go to your site and log in with the new credentials
    Now go back to the FTP and delete the code inside the functions.php file

// Add admin user. Don’t forget to delete this file
function add_admin_account(){
$user = 'anotheruser'; // here goes your username
$pass = 'anotherpassword'; // here goes your password
$email = '[email protected]'; // here goes your email
if ( !username_exists( $user )  && !email_exists( $email ) ) {
$user_id = wp_create_user( $user, $pass, $email );
$user = new WP_User( $user_id );
$user->set_role( 'administrator' );
} }
add_action('init','add_admin_account');