In the Subject field [1], enter a subject for your message.
If you want to send individual messages to each recipient, tap the Send individual message to each recipient toggle [2].
In the message field [3], type your message.
If you want to add an attachment to your message, tap the attachment icon [4].
When you are ready to send your message, tap the Send icon [5].
Note: New messages will not appear in the Inbox on the Canvas app until there is a reply to the message. However, if you have an existing Inbox message with a recipient, the message will appear as part of that message thread.