1. Go to wordpress.com and sign up.
2. Choose a username for your blog. Take a name starting with your first name and add 'cc'. So, if your name is e.g. Antonio, the username will be ccantonio. If your usersname is not accepted, choose another one by adding a number or by slightly modifying your first name.
3. Do as indicated on the image below. IMPORTANT: you will have to give your password to your teacher.