XAMPP only offers MySQL (Database Server) & Apache (Webserver) in one setup and you can manage them with the xampp starter.
After the successful installation navigate to your xampp folder and execute the
Press the start Button at the mysql row.
Now you’ve successfully started mysql. Now there are 2 different ways to administrate your mysql server and its databases.
But at first you have to set/change the MySQL Root password. Start the Apache server and type
127.0.0.1 in your browser’s address bar. If you haven’t deleted anything from the htdocs folder the xampp status page appears. Navigate to security settings and change your mysql root password.
Now, you can browse to your phpmyadmin under
http://localhost/phpmyadmin or download a windows mysql client for example navicat lite or mysql workbench. Install it and log in to your mysql server with your new root password.