Go to the search box on the side, type the title of the article you want to create, and press Go. If the article does not already exist, it will say "You may create the page" followed by a red link. Click the red link to create an article with that title.
Before you go ahead and create a new article, I suggest you read Wikipedia:Your first article first and follow the instructions and guidelines there.
Also, please sign all comments you make on a talk page by adding ~~~~ after your comment. This will add your username and the date and time of you edit which helps other users follow a discussion.