When you click on Sitemap at the bottom of your website page, it opens up the error page which says: This is a 404 page.
This is because the Sitemap page has not yet been created. You can easily create the Sitemap page in 30 seconds.
To create the site map page:
1. Go to the wp admin (Dashboard)
2. Go to Write >> Write Page (not a Post).
3. Type in the title, any title such as “Sitemap” (without the quotes).
4. Find the “Page Template” panel below the area where you would normally write the content for the page and choose sitemap.
4. At the Comments & Pings panel, uncheck both Allow comments and Allow Pings.
5. Click publish and you’re done.