Inserting an Ad

Hello willow27,
depends on the position where you want to place the ad. If you want to add ads in the sidebar, simply add ‘text’ widget and place the code there.

Make sure you do not modify theme files directly – but rather use a Child Theme for those kinds of changes:

http://codex.wordpress.org/Child_Themes

You might also want to look at using a plugin to help you with this kind of thing:

http://wordpress.org/extend/plugins/search.php?q=ads