as far as I know, CMS is something you need to implement. It does not come standard with a theme. A simple and easy to set up CMS stack is Quick Editor by 1LD. But there are others that work nicely as well. For a more complex CMS system you need to set up a database on your server. When working in Foundry by Elixir (not a template system, starting from a blank canvas) Alloy is very good.