To add a new article to the Help Center, navigate to the admin dashboard and select Knowledge Base from the sidebar. Click New Article, then enter a title and choose the appropriate category. Use the rich text editor to format your content, add images, and include any necessary links. You can also set visibility options to determine whether the article is public, internal, or restricted to specific user groups. Once you're satisfied, click Save Draft to keep working later or Publish to make it live immediately. Your article will then appear in the Help Center under the assigned category.