Adding an eCommerce theme to your WordPress site involves a few simple steps: 1. Go to your WordPress dashboard and navigate to Appearance > Themes. 2. Click on the "Add New" button. 3. You can search for specific themes using the search bar or browse through the featured, famous, or latest themes. Look for themes optimized for WooCommerce if you plan to use this plugin for your online store. 4. Once you find a theme you like, hover over it and click the "Install" button. 5. After the theme has been installed, click the "Activate" button. 6. Once activated, you may need to configure the theme settings according to your preferences and requirements. Most themes will offer a customization guide or instructions. 7. If you haven't already, install and activate the WooCommerce plugin and follow the setup wizard to configure your online store.