Fixed : solve : Vi donts open if you write thiscommand : vi /etc/yum.repos.d/CentOS-Base.repo Fix : cd /etc/yum.repos.d/ than vim CentOS-Base.repo this works Hi there : I know how Vi works almost but stil walking at some problems i follow this link : http://www.howtoforge.com/perfect-server-centos-5.5-x86_64-ispconfig-3-p3 i need to do : 7 Install Some Software First we import the GPG keys for software packages: rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY* Enable the contrib and centosplus repositories: vi /etc/yum.repos.d/CentOS-Base.repo Edit the lines below: [base] [...] exclude=postfix [...] [update] [...] exclude=postfix [...] [centosplus] [...] enabled=1 includepkgs=postfix [...] [contrib] But the file is empty i need to Write all those text? or? Regards doggggggy