I am using a plug-in called Quick Adsense to apply ads to every blog post on my WP blog.
At the moment, I only want to show the ads on a few of my posts so I want to apply a piece of shortcode (<!--NoAds-->) into the HTML of every blog post. and then manually remove that from the posts where I want the ads to appear.
How can I quickly and easily add the below piece of code to the very start of the HTML part of every single blog post?
I have over 1300 posts so doing it manually at this time is not an option.