Hi Vlad,
Thanks for being so supportive.
You may realize by now I am not code savvy, i wish I had the time to learn it, but I am a project manager and business strategist. Clients are asking me to build their websites because I understand how to challenge and construct their business strategy into a website, other designers are not doing that for them.
I should have done the child theme at the start, but been having trouble since the start.
If you can be so kind, can you give me the correct child theme codes?
Every time i use the codes below, it tells me I am missing index.php file. If you still have the details for the login details site, you are welcome to have a look. I’ve not altered the theme’s folders in any way,
I’m not that clever 
thanks
/*
Theme Name: Perth Pro Child
Theme URI: https://athemes.com/theme/perth
Author: aThemes
Author URI: https://athemes.com
Description: Perth Pro Child Theme
Version: 1.10
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: perth-pro-child
Tags: light, two-columns, right-sidebar, fluid-layout, responsive-layout, custom-colors, custom-background, custom-header, custom-menu, featured-images, sticky-post, theme-options, threaded-comments, translation-ready
*/