You can add two types of widgets to your site: site widgets and section widgets. A site widget is a widget which will be added to an entire site or page. A section widget, on the other hand, will only be added only to a specific page.
Adding a Site Widget:
Click on the drop down menu icon on the top-left side of the screen and select the General Settings option.
On the new window that has opened, click on the Page Widgets tab, and choose the widget you wish to add.
Adding a Section Widget:
Click on one of the elements of the required section, hover above the first row and hit the '+' sign to see the list of elements.
From the list of elements, choose the Widget element.
This will open the Widgets panel, and will allow you to add one of our widgets to the section.
You have two types of widgets: Inline and Media.
An inline widget will be added to the section as a regular element. It will be located among the other elements of the section.
A media widget needs a larger visible space, hence it will be added to the background of the section.
Each widget has its own set of settings. Make sure to configure it to your needs.