You have three main paths to edit WordPress design, depending on how much control you need. The WordPress Customizer (Appearance > Customize) handles basic edits like colours, fonts, logos, menus, and widgets without touching code. Most modern themes expose 60-80% of their design options here, and changes preview live before you publish. This works for quick branding tweaks or adjusting layouts on simpler sites. Page builders like Elementor, Beaver Builder, or Divi give you drag-and-drop control over individual pages and posts. You can rearrange sections, change backgrounds, adjust spacing, and swap modules without writing HTML or CSS. Page builders add some performance overhead (typically 200-400kb of CSS/JS), but they let non-developers redesign landing pages or service pages in 20 minutes instead of waiting on a developer. We use Elementor Pro on about 40% of the portfolio because clients can make changes themselves. For structural changes, you edit theme files directly. Go to Appearance > Theme File Editor to modify templates, stylesheets, or functions.php in the WordPress admin, or use SFTP to download files and edit them in a code editor. Critical rule: always create a child theme first. When the parent theme updates, your edits disappear unless they live in a child theme. A child theme is just a folder with style.css and functions.php that inherits everything from the parent but lets you override specific files. Common edits include: - Adding custom CSS in Appearance > Customize > Additional CSS for small visual fixes - Modifying header.php or footer.php to change layout structure - Editing page templates to control how specific pages render - Adjusting functions.php to remove default features or add custom behaviour If you are running a business site generating revenue, test design changes on a staging environment first. We have seen clients break mobile navigation or contact forms by editing the wrong template file. WordPress does not version-control your theme edits automatically, so keep backups or use a plugin like UpdraftPlus before making structural changes.