Blogger maintain a unique address as blog's sitemap address. You don't need to generate a new address for it. All you just need to do is finding relevant sitemap address for your blog and provide it whenever you need to submit your sitemap. Generally, your sitemap includes recently updated posts only. So if you update an old post and submit default sitemap, your post update won't notify for search engines. So you may have to alter sitemap address to populate all of your blog page addresses. Let's discuss how to find default sitemap address and alter it to grab all of your post URLs. You might think this is a advanced scenario to find your sitemap. But its neither advanced nor hard to find.
1. Type your blog URL in the address bar of your web browser.
2. At the end of your URL, append /robots.txt and hit Enter.
3. It will open up a simple page with text. As you see at the end, you can find your default sitemap address for your blog.
Also you can make use of below instead of what you found,
- Your Blog URL
Add your blog URL here with preceding http://
i.e: If you have 21 posts published on your blog, use a number larger than 21. It may be 22, 30, 100, 500, 1000 or even 100000. It will include all available page URLs with your specified limit.
5. Now you can submit your sitemap to relevant services.