Magicpedia is an open-source encyclopedia that can be edited by everyone.
How to Edit A Page
Anyone can do that. As a community, though, editing pages should only be necessary for the creation of content or the correction and addition of content. For instructions on editing pages, see Help:Editing or Magicpedia:How to edit a page
How to Make a Page
Making a page only requires that it doesn't exist. Type what you're looking for in the search box on the left, the wiki will give you the option to create a page.