If yo uare wanting to ad da number of tags to your website (like remarketing tags, site confirmation tags etc)
Then you should look at signing up for a free Google Tag account
https://www.google.com/analytics/tag-manager/
Google tag manager gives you an easy to use website interface where you can add / remove website tags with ease.
Once you have created your google tag account you will be given an html snippet to ad to your website .
Simply copy this code and add it to your website via the admin area
A few more details about Google tags can be viewed at:
https://support.google.com/tagmanager/answer/6103696?hl=en
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