I got a MediaWiki, and almost all is working fine, but when i try to edit a page with an user, the page `?title=User:{username}"

I got this message

There is currently no text in this page. You can search for this page title in other pages, or search the related logs, but you do not have permission to create this page.

Which $wgGroupPermissions should i use to allow an user to edit only his own user page without being able to edit other pages & content ?