Wikipedia Editing Basics
First, create a Wikipedia account. You don't have to have an account to edit, but it's highly recommended. With an account, contributing is easy!
Second, walk through the Art + Feminism Introductory Lesson Plan.
Third, watch the Adding Citations on Wikipedia Youtube video.
Fourth, watch the Adding Images to Articles Youtube video.
Fifth, before you begin editing, try out your new skills in the Wikipedia Sandbox.