You can access everything on the MDN website even without an MDN profile. However, by joining MDN, you'll be able to edit docs and have your own profile page.
您可以无须账户的访问 MDN 网站的任何地方。但是，如果您加入了 MDN，您就可以编辑文档和拥有一个自己的个人资料页面了。