Header image

Hi, I am using the free version of Safreen. The homepage looks good but I can’t find a way of adding a header image to any pages or posts as shown on the demo – https://safreen.imonthemes.com/demo5/index.php/sample-page/ There isn’t an option in the Customizer. Featured images do not appear either as a heading as they do on other themes.

There also doesn’t appear to be a way of adding an image to the Welcome section as show here – https://safreen.imonthemes.com/demo1/

Can anyone help please?

thanks