WARNING: by continuing following this guide you are putting your machine at risk by disabling the secuity features within SELinux, I strongly advise if you do not know what you are doing, stop and read up on the implications this action will have before continuing. Some information is avaible in the Fedora Wiki here .
Open up this file:
sudo gedit /etc/selinux/config
Change the line that looks like this:
Save and reboot and it should be working, although again be warned this has disabled the security mechanism on your system. To re-enable this, simply do the same however change from permissive to enforcing and again reboot your machine.