Add a widget
Before you can add a Widget, you need to make sure the theme you’re using supports widgets. Most are widget ready, with multiple designated widget areas. However, they aren’t required to support adding them, so If you do not see any widget-ready areas (side bars) you cannot add a widget to your theme.
There are multiple ways to add widgets to your sidebars. The easiest option is just to drag and drop them to your chosen sidebar. Select a widget in Appearances > Widgets, drag it to your sidebar area and dropping it into a sidebar in the Available Widgets area. The widget will automatically save. Now that you’ve added a Widget, WordPress will automatically update your theme.
You can also add widgets using the customizer page with live preview. From your dash, click Appearance then Customize; you can add widgets to sidebars from here. It’s worth noting that not all of your widget-ready areas and sidebars will appear in the customizer. The preferred method is using the Appearance > Widgets screen to add widgets in WordPress.