by Tim Hunt.
Git may already be installed. Try typing one of the the commands
which git
or
git --version
If git is not already installed, then I am not sure if you hosting package will let you install it.
Mind you, http://www.tomvernon.co.uk/blog/2009/12/install-git-on-plesk/ (which I got from https://www.google.com/search?as_q=Parallels+Plesk+Panel+install+git ) seems to suggest yum install git should work.