On the Omniverse Nexus, all pages are protected in some way. Unfortunately, because of spam attacks, protecting pages from being edited or created by non-users is necessary. To be able to create and edit pages, you need to click on the Discord channel link in the sidebar and discuss your ideas with the community. If all goes well, then User:Krayfishkarl will create an account for you and give you your new password.
However, some pages have greater protections. Some pages deal with how the website looks and feels, are extremely visible like the main page and logos or set out the rules that we follow. Pages like these can only be edited by Administrators or Bureaucrats, a list of which can be found in the Staff page.