You need to login to the site in order to conduct actions under the privileges of your username, and to be able to claim control (if you have the permissions), and point reward, over the content you submit.
You may also need to login to access restricted zones, categories, and pages.
The add news page
allows you to add your news to the site. For most members, this will put the news into a validation queue and inform the staff of the submission.
Other things you may do
You may see submission links on the menus, and in other places. Submitting any kind of entry will be a similar process to submitting news: your entry will likely be put in a validation queue.