Help Needed

The link manager has been disabled by default starting in 3.5 on new installations. You can enable the link manager by using a plugin solution: http://wordpress.org/extend/plugins/link-manager/ or by navigating to yoursite.com/wp-admin/options.php and changing the link_manager_enabled option from 0 to 1.

you will need to install and use: http://wordpress.org/extend/plugins/link-manager/

see:

http://wordpress.org/support/topic/troubleshooting-wordpress-35-master-list?replies=4#post-3547423

One other major change is the Link Manager. If you’re using it, you’ll want to install the Link Manager plugin – http://wordpress.org/extend/plugins/link-manager/ – because it’s going away. Don’t worry, if you’re using it, it will still be there, but if you’ve never used it, it will become invisible.

edit:
;-( Clayton was faster – time for a break.