Margin to the right

Hi, I just installed the SIMCLICK template on my website insidethesocietyofthespectacle.com but I can't use the full width on my landing page. Can you explain how to remove the right margin in blank on WP? Do I need to customize the size in the settings ? Please take a look here https://insidethesocietyofthespectacle.com/ Thanks ! Have a nice day AA