Customizer, click on the Widgets tab. Your theme’s available widget areas will be displayed (and might look slightly different to this):
To add a widget, first click on a widget area. In the panel, click on
Add a Widget. The Customizer will show all of the available widgets that you can add.
Scroll the alphabetically ordered list of widgets, or use the search field at the top to find one. Then, click on a widget to add it. The Customizer will then display a box to configure the widget’s settings.
When you’ve finished updating these fields, click
Close on the bottom left of the widget box. You can also reopen and update a widget using the small down-facing arrow, or remove it by clicking Delete.
You can reorder these widget panels as well — hover over one and mouse-click to select and drag it up or down, depending on where you’d like it to display. After making your changes, don’t forget to save them by hitting the blue
Save & Publish button at the top of the panel.