Appearance > Widgets
Appearance > Customize > Widgets
Exoplanet has support for these sidebar widget areas; Right Sidebar, Left Sidebar and Shop Sidebar for compatability with WooCommerce.
It also supports 5 additional widget areas; 4 footer columns and a full-width middle footer area which sits between the footer columns and the bottom footer.
Simply drag and drop any of the standard WordPress widgets – or widgets of your activated third-party plugins – into the widget area(s) of your choice.