If you head over to the article, you'll notice a little lock symbol at the upper-right corner of the page. This lock indicates that the page has been semi-protected; clicking it will take you to WP:SEMI, which explains what's going on. To put it simply, the article has been protected to prevent editing by unregistered and brand new users due to high levels of vandalism to the page. Your account will need to be autoconfirmed in order to edit it, which will usually happen automatically once your account is four days old and you've made ten edits to Wikipedia.
Now, you don't necessarily have to wait for the ability to edit the article. You can head over to the article's talk page and submit a request for another editor to edit the page for you. You may create a new section at the bottom of the talk page, specify what exactly you wish to change in the article, and then add {{edit semi-protected}} to your message to alert other editors that you've made a request. A helpful fellow editor should help you soon.
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A quick and basic answer to users asking about the semi-protection of an article, and/or how to edit said article.
{{subst:Explain semi-protected}}
{{subst:Explain semi-protected|article}}
