CMS Made Simple Forums

Hello everyone,
I am a beginner in CMS Made Simple and am having difficulty in customizing the user interface. I have successfully installed the CMS and a sample interface, but I do not know how to edit components such as header, footer or page layout as I want. I also want to add a few modules such as contact form or display featured posts but I do not know how to integrate. Can anyone in the forum guide or show me detailed documentation to do it? I look forward to receiving help. Thanks everyone!

The documentation is at https://docs.cmsmadesimple.org/

Header, footer, etc are all in Design Manager. Edit the html/css of the template you want to use. For something like featured posts you probably want to be a lot more specific with a separate forum post detailing where you're stuck.