Go to your Cookie-Script.com account and copy your cookie-script code.
Log in to your Magento Admin Dashboard.
Go to the Admin menu, select System > Configuration.
From the left menu, select Design.
Click to expand the HTML Head section.
Paste copied Cookie-Script snippet into the Miscellaneous Scripts text area.
Tap the Save Config button.
Cookie-Script is installed on Magento now and should be ready for use.