Running fdisk -l on the Fedora guest should show some unpartitioned space, probably /dev/sdb. Then you can partition it with fdisk, cfdisk, or if you're more comfortable with a graphic tool, gparted. (gparted won't handle logical volumes though, so may show your already existing install as unpartitioned space.)
If you want to expand the current root partition, (assuming you took defaults and it's an lvm) then the steps would be use fdisk to create an lvm partition, make a physical volume on it, make a volume group on the physical volume, expand the existing volume and then resizing the file system. I have a page on LVMs, which might help--though it's only a so-so page at present.