How do you put ads in the homepage other than the sub footer?

We're want to know how put a ad on the footer that appears only homepage so it doesn't appear on the other pages such as the main events and groups page.

Put the ad code here:

templates/base/page_1.html

__page_main_code__

Place it above or below the above code, below will display the ad on bottom, and above will display the ad on top

ok. Thank you.