You do not need to login or register to leave a comment on this site. However, if you intend to leave more than a few comments, it will be easier to register so you can log in and forgo providing your name and email address each time.
All comments must be approved by a moderator before appearing on the site, so allow time for that to happen.
At this point, after your login is approved, you will be able to add your own articles. When you log in you will be taken to the “Dashboard” where, in the upper left corner there is a thumbtack. If you click on the thumbtack you will be able to submit an article. It will appear on the site after the administrator approves it. (Approval is necessary because you wouldn’t believe what people will post on an unmoderated site.)