It depends how you installed it.
If you install it using the recommended way, where you upload the files yourself and run zc_install/index.php to supply your database settings and configure your store details, it will tell you at the end of installation that your admin path is: your_site.com/admin And visiting that address will remind you that you need to change the path for security reasons, which you would do using your FTP program.
But if you install it with some sort of automated installation tool offered by your hosting company, then the admin path is whatever they told you they set it to when installation was done. They're the ones who control that.