General options concerning the website layout can be found in the "Layout" tab in the "Theme options" page.
If you need to make specific customizations to the theme appearance, you can use the "Custom frontend CSS" textarea located under the "Custom CSS" tab in the "Theme appearance" page.
In pages and post-type entries, a box called "Template options" is entitled to manage all the options concerning the appearance of the page or post.
Custom sidebars can be created from the "Theme options > Sidebars" section
Sidebars are actually not available on the 404 page.
The theme can display a footer section at the bottom of all the pages. The section can be structured to have a number of columns of different widths. The Layout option under the Footer heading will allow you to choose both how many columns you’re going to have in the footer and their dimensions.
Selecting the “None” option will disable the footer area entirely, while selecting a column configuration will automatically create a new WordPress Widget Area. A widget area is a section of the page which can be filled with widgets, which are little, reusable and configurable bits of contents. To learn more about widgets, you can refer to their WordPress documentation page.
Footer widget areas are named as “Footer column #”, and can be edited under the
Appearance > Widgets section of the WordPress administration.
The theme has been designed to adapt itself to various screen sizes, like the ones used by tablets and phones. In order to get the most out of the theme even on these kind of devices, make sure to enable the appropriate responsive feature, in the "Responsive" section of the "Layout" tab.