Where is admin area?

When Joomla has its own administrator area, where is the same kind of place to Zen-Cart that I installed?

After installation I shut down my computer and I forgot to check the address for admin pages. Now I can't find any hints to find those. I tried https://www.mysite.com/store/amin (or administrator) but didn't find...

Please, I'm sure that someone knows :).

Thanks!

Ok,
So admin area is where I thought it would be, but the only thing I get is:

Warning: main(includes/application_top.php) [function.main]: failed to open stream: Permission denied in /home/formiko/public_html/store/admin/index.php on line 23

Warning: main(includes/application_top.php) [function.main]: failed to open stream: Permission denied in /home/formiko/public_html/store/admin/index.php on line 23

Warning: main(includes/application_top.php) [function.main]: failed to open stream: Permission denied in /home/formiko/public_html/store/admin/index.php on line 23

Fatal error: main() [function.require]: Failed opening required 'includes/application_top.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/formiko/public_html/store/admin/index.php on line 23

What's this?

Many thanks,

Upload includes/application_top.php again. It may have gotten garbled during the install or upload.

After putting the file again and changing permissions to 644, there's new note for me:

Warning: is_dir() [function.is-dir]: Stat failed for /home/formiko/public_html/store//includes/classes (errno=13 - Permission denied) in /home/formiko/public_html/store/admin/includes/application_top.php on line 63
ERROR: Admin configure.php not found. Suggest running install? Click here for installation
Warning: main(/home/formiko/public_html/store/includes/autoload_func.php) [function.main]: failed to open stream: Permission denied in /home/formiko/public_html/store/admin/includes/application_top.php on line 130

Warning: main(/home/formiko/public_html/store/includes/autoload_func.php) [function.main]: failed to open stream: Permission denied in /home/formiko/public_html/store/admin/includes/application_top.php on line 130

Fatal error: main() [function.require]: Failed opening required '/home/formiko/public_html/store/includes/autoload_func.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/formiko/public_html/store/admin/includes/application_top.php on line 130

Do I have to install the whole thing again?

BR,