Professor Home in Navigate will allow you to see all of the students enrolled in your courses for the designated term (make sure to verify the current term is selected). You will see Class Listing at the top of the page, these are the classes you are teaching for the specific term. Underneath Class Listing, you’ll see Students in My Classes. This area will show you all of the students enrolled in everyone one of your classes. It is here where you can check the box for a student(s) and send messages out to people (after clicking the box next to the students you want, click on the Actions arrow underneath Students in My Classes and click on Send message).
If you are also an advisor, you will see your assigned students below Students in My Classes.