There is a several actions inside ExS WordPress theme that you can use to show your custom content such as advertise banners in our theme. They are:
exs_action_before_header – fires before theme header markup.
exs_action_after_header – fires after theme header markup.
exs_action_top_of_main_column – fires at the top of main column section.
exs_action_bottom_of_main_column – fires at the bottom of main column section.
exs_action_top_of_aside_column – fires at the top of sidebar column.
exs_action_bottom_of_aside_column – fires at the bottom of sidebar column.