After purchasing, you can instantly download the theme file. Upload the it to Shopify (Admin Panel -> Online Store -> Themes -> Upload Theme). You'll get a license key that you can activate following a link in the purchase confirmation email.
After this, you are ready to start modifying the theme to make it perfect for your brand. Simply click Customize, and settings are opened for you to start exploring. We have a Help Center with detailed instructions on how to use every single setting in the theme. You'll get access to this once purchasing.