and advertising code to copy and paste to the HTML source code, to the site to add more advertising unit is also very simple. Use " ad layout code " options on the page can be customized for each ad unit:
through the https://s.google.com/adsense/ login to your account click the Settings tab >
select advertising format and any options required for advertising.
the advertising copy and paste the code into your opinion, plus a group of advertising will be more help "HTML source code.