The files will be in the folder on your server where you put them during the installation...
If your zencart loads when you type into your browser:
www.mywebsite.com
... then your ZC installation is in your site ROOT folder (often called public_html, or www, or just html - ask your host what the root is labelled on your server if you're not sure.)
If your zencart loads when you type into your browser:
www.mywebsite.com/store
... then you have installed ZC in a SUB-directory called "store" and it will be found under public_html/store, for example.




