1. Click Site Settings in the left sidebar.
2. Click General.
3. Turn the notification on.
4. Select a language (English is the default).
5. Click the preview link to check out your notification. When you're finished, republish your website to make the changes live.
How do I customize cookie notifications?
Unfortunately, we don't have the ability to customize cookie notifications at the moment though this is on our feature request bucket list.
As a workaround, you can try using the notification insite to create a warning notice for first-time visitors stating the cookie law.