Find the Classlist tool by click on the "Classlist" tab in the blue navbar on your course homepage. 

You can email the entire class by clicking on the "Email Classlist" button at the top of the page. You can also email or instant message select users by clicking on the box to the left of their image and then clicking on the blue "Email" or "Instant Message" buttons.

Click on the caret to the right of a student's name to email them, view their course progress, or groups they are in. You can also "Edit Accommodations." 

The "Edit Accommodations" button gives you the ability to give a student extra time on all quizzes in the course.

Click the blue "Save" button when finished.