You will first select your address book by clicking on the dropdown arrow next to the "Select Address Book" option.
You will have the choice between "All Teachers" and "My Teachers." Once you select your address book, the names of the teachers located within that address book will appear.
You can now select the person you would like to send your message to by checking the box next to their name.
Now click the green "<< Add Selected" button.
Those that you selected will then be moved to the "Selected Recipients" area just to the left in the address book.
If you have more than one person you would like to receive your message, you can continue to add recipients until you have all of them listed in the "Selected Recipient(s)" area.
If you decide to take a person off of your message, you can check the box next to their name and click on the "Remove Selected" button.
Once you are ready to write your message click the green "Submit" button.