My WP don't have wordpress update message :|

This is a normal wp : http://i114.photobucket.com/albums/n275/thanhtungtnt/normal_wp.png
And this is my wp: http://i114.photobucket.com/albums/n275/thanhtungtnt/my_wp.png

I need use screen option (darkgreen section) but I don't see that tab.

I don't use any plugins to hide them!

My WP is version 3.1 on bluehost (created automatically from service of bluehost)

If can, please guide how to add CSS classes to menu like this http://cdn.wpbeginner.com/blogposts/stylemenusclasses.gif

Read more: http://www.wpbeginner.com/wp-themes/how-to-style-wordpress-navigation-menus/

Thank you!