Permalink structure cannot be changed on any site hosted by wordpress.COM. You are confusing wordpress.COM hosted sites and wordpress.ORG software installs on paid hosting.
Please read: Moving to Self-Hosted WordPress https://move.wordpress.com
WordPress.COM and WordPress.ORG are completely separate and have different username accounts, logins, features, run different versions of some themes with the same names, and have separate support documentation and separate support forums. Read the differences here http://en.support.wordpress.com/com-vs-org/
If you don’t have a username account at WordPress.ORG account, then click http://wordpress.org/support/ and register one on the top right-hand corner of the page that opens, https://wordpress.org/support/register.php so you can post to the support forums there.
Resetting your WordPress.ORG password http://codex.wordpress.org/Resetting_Your_Password
WordPress.org support docs are at https://codex.wordpress.org/Main_Page
See also https://apps.wordpress.org/support/
The topic ‘Permalink changes’ is closed to new replies.