Re: what is bootloader stage1 target device?
Well, just where you create the partitions, you have to add (or insert) it.
The same screen where you have to set root, /boot, swap.
If you chosen to automaticly create partitions, it should have done it for you.
Fedora Manual: http://docs.fedoraproject.org
sudo st tweak repo toggle fedora-rawhide ; st iso dl-fed -respin && st iso usb