How I change templete during working website?

I didn’t know that there are templetes in webflow.
I’m making my website from blank webpage and my plane is CMS.
I want to start new from templete.
But I don’t know what to do?
When I clicked free templete, it maked me another site. This is not what I want.
I’d like to my CMS plan site has free templete.

Once a project is launched from a template there is no option to replace it. You could manually copy and paste elements from one project to another or simply start again from scratch.