how can Create the xml sitemap..?

To add a sitemap to your WordPress site, first thing you need to do is install and activate WordPress SEO by Yoast plugin. By default, WordPress SEO does not enable XML sitemap functionality, so you will have to turn it on. To do that go to SEO » XML Sitemaps and check the box to enable XML sitemap functionality.
Enable XML WordPress Sitemaps in WordPress SEO plugin
When you check the box to enable XML sitemap functionality, WordPress SEO will show you a number of options that you can configure for your Sitemaps. If you are unsure about what to do with them, then ignore them and click on Save settings.
Now your sitemaps are generated and publicly accessible. WordPress SEO will show a XML Sitemap button which you can click to view your sitemap_index.xml sitemap.
 
Generating a XML sitemap for you website is a simple process, and there are many websites that can help you do so. Google recommends using xml-sitemaps[dot]com
Start by visiting the link above in your web browser. On the home page of the website you can follow the 4 easy steps they have listed there.
 
There're many ways to create site map. Usually if your website based on Wordpress platform, you can use the plugin called Google Sitemap Generate or Yoast SEO plugin to help creating sitemap.

Otherway, if your website is based on PHP or another platform, you need to create manually by using this webstie https://www.xml-sitemaps.com/. Just enter your website on that website and create.

Hope this helps.
 
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