Updating the main page navigation & downloading Themes and add-ons

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I have 5.7.5.13 version of concrete5. When I try to update the navigation menu and make changes on the Home page. and apply the changes for the "entire site", it does not update the child pages. Any idea how I can remedy this?.

Also I cannot download and apply themes or add-ons, any idea as to what the cause of this is?

 
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
If your navigation area is in your header.php file, make sure the area is a GlobalArea like this
$a = new GlobalArea('Your Area Name Here'); // substitute 'Your Area Name Here' for  your area name

If your navigation area is in a theme template and is set to GlobalArea then only those pages that use that template will display the updated nav..
TONYDIAS replied on at Permalink Reply
Thanks. How do I change the settings in the Theme? I can't change the theme or add any add-ons either.