If you're using Simple Blog, your blog post permalink automatically updates when you change the title of your blog post.
The URLs of your blog posts will automatically show up as yourcustomdomain.com/blog/blog-title.
Customizing Your Blog Post Permalink
You also have the option to customize the permalinks for your blog posts. In the blog post editor, click the [PUBLISH] button, select the “Use custom URL” option, and then enter your blog post permalink.
After you click [Publish Post], your blog post URL will update immediately.