Hello Omari,
Thank you so much for using our theme. If you want to add the advertisement, you have AT Advertisement Widget on the theme. With the help of that widget, you can easily add the advertisement on the respected widget area like home main content area, footer area, sidebars etc. Either you can use Text Widget as well.
You have options to add advertisement inside Appearance > customize > Header options > Header Advertisement as well.
Please check all the available options as well.
Regards
Acme Supports