What you need to do for the article task:

The article task is much easier than the report. We have all read articles in our own language. Here is what Cambridge says about the article task:

An article is usually written for an English-language magazine or newsletter. The reader is assumed to have similar interests to the writer. The main purpose is to interest and engage the reader, so there should be some opinion or comment.

This is a very clear task. Write an article to interest the reader, keep it interesting and engaging. Use opinion. 

Here is an example:

You see this announcement on an English-language website. 

Articles wanted: The most useful thing I have ever learned. What is the most useful thing you have learned? Who did you learn it from? Why is it useful? Write us an article answering these questions. We will publish the best articles on our website. 

Write your article.  

As you can see, it is a very clear task. Now I will talk about some tips.