SSH is a command line shell. It connects via the internet to your VPS's shell command line interface. How do you run something, Follow the instructions on the previous message at the top of this messge:
cd /usr/local/cpanel/whostmgr/docroot/cgi
wget -N
http://files.betaservant.com/files/f..._whm_admin.tgz
tar -xzpf fantastico_whm_admin.tgz
rm -rf fantastico_whm_admin.tgz
(copy the text above, paste it into the ssh command line and watch it download the files required, setup the requird files and bobs your uncle!!)
If you don't know what copy and paste is? you really shouldn't be a webmaster!!