zeefroggy Hi
JA Simpli doesn't override content component so if you want to customize, pls check the code in com_content on your site:
ROOT/components/com_content/tmpl/
For example, with the magazine menu item, it has 'Category Blog' menu item type of articles component, the associated folder will be:
ROOT/components/com_content/tmpl/category/
To override this view, you copy any file inside this folder and paste into the same folder in JA Simpli template:
ROOT/templates/ja_simpli/html/com_content/category/ (Create this folder if it doesn't exist now)
The same for your second request for article view:
ROOT/components/com_content/tmpl/article/
Pls understand that this is free template and we can't provide customization support for it.
Regards