How do I submit sitemap in sitemap submission sites ?

Steps to submit sitemap in sitemap sites are following
a) Select your site on your Google Search Console home page.
b) Click Sitemaps from the menu on the left.
c) Type sitemap.xml in the text field next to your domain.
d) Click Submit.

Visit your Webmaster Tool dashboard and choose Site Configuration and then Sitemaps on the left hand sidebar.
Click the Add/Test Sitemap button. ...
Enter /system/feeds/sitemap into the text box that appears.
Click Submit Sitemap

Hi Friends,
First of all, you should build a sitemap.

When it's ready, go to Google Search Console and click on "Start Now." You'll be brought to your new dashboard where you can add properties (domains) or view the current properties you have. Click the dropdown in the menu pane for "Search Property" and select your domain. If you don't have any properties, you should create it.

Once you add the domain, Google will need verification of ownership. When you verify your domain, you'll be brought back to your dashboard with an overview of your website. Using your menu panel, select "Sitemaps" to proceed to the next step.

Go to Webmaster Tools site.
Select the site of the sitemap.
Click Site Configuration-> Sitemaps.
Click Add/Test Sitemap which is located in top right corner.
In the box that pops up, paste the following code: /system/feeds/sitemap.
Submit the sitemap.

Sign in to Google Search Console.
In the sidebar, select your website.
Click on 'Sitemaps'. The 'Sitemaps' menu is under the 'Index' section.
Remove outdated or invalid sitemaps (if any) like sitemap.xml.
Enter 'sitemap_index.
Click Submit.