Please keep in mind that in some cases, there may be conflicts with other urls on your site that have already "reserved" the url (for example, a category with the url your-blog.com/keyword-phrase. In that case, the permalink function may not work.
Also, in order for this function to work, please make sure your pemalink settings are set to something like: Post name: your-blog/sample-post/ or: Custom structure: /%postname%/
Article ID: 107
Category: 1-Click WP SEO