I want to order for year in centova, but i found my server does not support ssh, so now i am in free trial for test, if it's work i will buy. so what shall i do? how can i make centova work in my website?

my server is fatcow.com

Centova Cast does not run on web sites, it runs on dedicated servers or VPSes.  If you don't have SSH access to your server then you almost definitely don't have a dedi or VPS.

If you do have a dedi or VPS but no SSH access, then you must have a management contract, in which case your hosting provider would be in charge of installing Centova Cast for you.