Need help in adding adsense code

Hi. I need real help with pasting the adsense code. I tried looking in youtube and google and there’s just too much information. The closest information I’ve found is going to the site’s FTP and not the admin control panel.

So far I’ve just logged in to my site’s FTP. I don’t know what to do next. Am I even in the right direction?

We actually need more information. How are you building your website? Coding by hand? PHP? Pure HTML? A CMS like Joomla, WordPress, Drupal?