Difficulty: Moderately Easy
Open an account in Wikipedia
Step1
Go to http://en.wikipedia.org/wiki/Main_Page. You can also key in "Wikipedia" in search engines like Google or Yahoo.
Step2
Go to the top right corner of the page. Click on "Sign in/create account." Register yourself by providing a Username and Password. Once you've been added, your Username will appear in red on the top of the page.
Edit a page in Wikipedia
Step1
Visit http://en.wikipedia.org/wiki/Wikipedia:List_of_protected_pages#Semi-protection. Remember that some articles cannot be edited. Check which ones you can first.
Step2
Examine some of the semi-protected articles. Protected articles can be edited only by Wikipedia administrators.
Step3
Select the semi-protected articles you think need editing. Read the page carefully and identify the information you want to edit.
Step4
Check with the Wikipedia Manual of Style. Make sure your editing follows their guidelines.
Step5
Click on "edit this page." A new page, with the existing text will open.
Step6
Start editing the page. Notify the sources used.
Step7
See the changes by clicking on "show preview" and save.
Step8
Write about these changes briefly in the "edit summary" section. Save the page again.
Step9
Submit the edited page to the Wikipedia editors for approval.