OMG mrwhizkid… THANK YOU SO MUCH !!!!!
I managed to get into my dashboard once i edited (which i still remember which part i did wrong) the php.function.
Hope this steps will help others :
CPanel > File manager > domain name > wp content > theme > child theme > right click at functions.php > edit (where i did the mistake) > save changes > login / refresh the website…. & voila !!!
