YUM edit on Fedora

Fedora Linux has few package managers (rpm , yum)
now , we will use yum as package manager.
we assumed , you have been installed yum ; its OK
then we will use yum :
1. we must choice repository (mirrors) where there are many fedora package
2. login as root
3. edit yum
vim /etc/yum.repos.d/fedora-extras.repo
then modify the '[extras] ' part to include your chosen mirrors:

[extras]

  name=Fedora Extras $releasever - $basearch
 #baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/$releasever/$basearch/

 baseurl=http://ftp.uni-bayreuth.de/linux/fedora/linux/extras/$releasever/$basearch/
 ftp://ftp.tu-chemnitz.de/pub/linux/fedora-core-extras/$releasever/$basearch/
 failovermethod=priority

 mirrorlist=http://fedora.redhat.com/download/mirrors/fedora-extras-$releasever
 enabled=1
 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-extras
 gpgcheck=1

4. exit vim
5. then you can use yum
yum update
yum install package-name