I have installed the child theme and looking at the file structure I have now wp-content/themes/integral and wp-content/themes/integral-child. wp-content/themes/integral-child contains 3 files style.css screenshot.png and functions.php. Can I edit the style.css from the filesystem and which one to edit the one in integral-child?
the functions.php is showing only:

Is this correct? And does the screenshot.png has to stay or it can be deleted?

I can see that integral is still active do I have to make the child theme active?

Kind Regards,

And thanks Rob