In order to perform your clicks of the Magali Chipie challenge, you must go to the free games page and click on the link at the top of the page "My Challenges" (you also have a button on the right).
Then click on the banner of the game concerned, then click on the Grid button. These clicks are to be performed within one day of the allocation of your Clicks. If you do not, then these clicks will be automatically made for you.