Hi,
How to create url for profiles and blog , for my registered users ?

Now:
BLOG : mydomain.com/index.php//blog/703-admin
PROFIL :mydomain.com/index.php/user/703-admin

to :

blog : mydomain.com/index.php//blog/username
profil : mydomain.com/index.php/user/username

or
mydomain.com/blog/username

or
mydomain.com/username

???

Thank you :)