Its function a big thank you

Find this file: /yourInstallDirectory/components/Stories/plugins/default/stories/head.php and make a backup. Then edit and replace .insertAfter with .insertBefore should do the trick.

Can I have help to know how to do it without destroying the already existing code please

Honestly, I'm always wondering about these "Is it possible?" questions when it comes to website layout. I mean, the world wide web proves best by millions of different websites that EVERYTHING is possible. It's up to you (your HTML) where exactly what will appear, be it by coding the structure from scratch or later inserting elements into an already existing structure or re-arranging parts of that structure.