Theme for Wordpress ( melodyschool...) how to change image!?

Hallo, I’m new to web design… I’ve purchased the MelodySchool for Wordpress but, really, I don’t understand how to change image and other stuff… and documentation doesn’t speak about…

You need to get familiar with the theme ( Elementor / Visual Composer / Gutenberg ) and WordPress.
If you still have questions, you can ask the item author