The "Email" tool allows you to select students and send emails to them.

Click on "Roles" under "Mail" to expand the recipients.

If you don't have the "Mail" tool on your site, please add it by going to "Site Info"

-> "Edit Tools".

Click on "Roles" under "Mail" to expand the recipients.

In the Cource Site, you will see three types of roles: Instractor, Student, and Teaching Assistant.

If you click on Student, you will see a list of your students, check the ones you want to send the email to and send it to them.