All widgets are accessible in Appearance > Widgets. Drag and drop the widgets you want over into the right hand side where your sidebars and footer widgets are listed. Simply drag your widgets over to the sidebar or footer column, and then populate the content.
There are various fields and settings you can choose for each individual widget and all are self explanatory. You can also use multiple widgets per footer column, just drag and drop them into place. And you can put as many widgets as you want inside of a sidebar. Once you have finished populating the widgets, always make sure to hit the Save button to save the settings.