An efficient XML sitemap will ease Google to find your website pages and there by improving your rankings. The sitemap file will help the search engine to find and index your blog content in the search engine.
Follow the below steps to install and submit your sitemap XML.
Step 1: Create your WordPress Sitemap.
There are many WordPress plugins available for sitemap creation. I have used Google XML sitemap which is one of the reliable one.
Download Google XML sitemap plugin, install and activate it.
This will automatically create the sitemap for your WordPress site.
Note: By default, your site map link will be http://domain.com/sitemap.xml
Step 2: Go to Google Webmaster Tools and Login.
You can login to the Google Webmaster Tools using your Gmail account.
Add your website to your account by clicking the button labelled ADD A PROPERTY.
Go to the sitemaps section of your website. Its is under the Crawl tab as shown in the screenshot below
Click the button labelled ADD/TEST SITEMAP to submit your sitemap.
You are done! You have successfully submitted your sitemap to Google Webmaster Tools.