if you installed at
http://www.mysite.com/osticket(http://www.mysite.com/osticket)
the public interface would be
http://www.mysite.com/osticket(http://www.mysite.com/osticket)
the staff (internal) interface would be
http://www.mysite.com/osticket/scp(http://www.mysite.com/osticket/scp)
to see the admin panel you must log on as an admin user in the staff interface.
hope this helps.