After installing, keep getting redirected to /admin which doesn't exist


I am trying to convert a joomla site to grav, and it’s my first time with the latter. I downloaded the admin+grav zip file and extracted it in my www directory on my debian box.

It now automatically redirects to my webroot/admin directory, which doesn’t exist. The zip extracted all as “grav-admin” in a subdirectory so I copied it to my “localhost/grav”. So basically I saw the first “issues found” screen which pointed to some permissions issues. By reading the 404 not found FAQ in detail and searching for answers here, I didn’t get any closer to finding out why it expects this /admin directory.

Am I missing something? And is there an irc chat to get support?