Permalink is link to individual blog post. In blogger, permalink can generated automatically based on post date and post title. Sometimes, if you use Blogger or Blogspot as platorm and you have mistake, you can edit post and permalink with this easy steps. This steps is for pubished post.
First, go to your post which you want to update, then Revert to draft.
In draft mode you can change the post and permalink in easy way.
After everything done, then re-publish again, and your title and permalink will be changed.