Inserting the Google Analytics code

Depends on the site, if you're using a CMS like Wordpress then you would edit the relevant footer.php file to paste the code in before the </body> body close tag, if it's a static html site then you would probably need to edit into each page individually.

EDIT: Just noticed you said html code, so looks like you'll need to edit each page unless you have any php includes or similar?
 
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