This is the original way to build a footer, before the advent of Avada Layouts. If you want a simple footer, with 1 to 6 columns, populated by widgets, then this is an easy method to use.
It’s a two-step process. Firstly, you head to the Footer section of the Avada Options (Options > Footer) and begin by configuring the footer area. See the Footer Options doc for specifics on all options available for the footer, but basically, you start by deciding how many columns you want in your footer, and then you configure the footer area with the Footer Content, Footer Background Image, and Footer Styling tabs.
The second part of the process is to populate the footer. This is achieved through the use of Widgets. See the Widgets section of the Docs for more info on this, but basically, widgets are small blocks that can contain a variety of content, and you can create your footer by populating widgets, and then adding them into the predefined Footer Widget Areas, found under Appearance > Widgets, from the WordPress dashboard.
See below for an example of a basic footer built using the theme options for the Taxi Demo. You can also see a walkthrough of the process of configuring the footer via the global options in the following video.