We'll create fresh WordPress site with WP Simple Anchors Links installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Simply add anchors links inside your content. Shortcode [wpanchor id="your_id"]
is added via a button in Wisiwig. After your need to create a link inside your site with #your_id for the href link. Your link look likes <a href="#your_id">my link</a>