To add, remove, or edit your sidebar, side menu & footer widgets, navigate to Appearance > Widgets.
On the left, you will see a list of the available widgets to choose from. On the right, you will see a few different widget areas in the theme.
To add a widget to your sidebar, simply drag & drop a widget on the left into the widget area titled "Sidebar". Once you've dropped a widget into the Sidebar widget area, click on its heading. A drop-down will appear and you can make any necessary adjustments to the widget's settings. From this widget setting drop-down, you can also delete the widget.
To position widgets within the sidebar, drag and drop them above or below each other.