Requiring registration to comment is working well so I’m keeping it (background).
When you register, the software sends you a random password. I recommend the first thing you do when you log in is to change it. To do that, click on your username above the comment box:
Type in your new password on the bottom right. If you have a blog, enter the URL in the Website field. If you get tired of your display name, you can save a new nickname and then select it in the drop-down box.
The other fields are pretty useless since they are only visible to me. I don’t think it needs to be said but your email address will not be sold or distributed.