@131007 Canvas Docs are a great resource.
Here is an article for Android and iOs
I hope this helps.
Hello NATHAN RIBBON,
I understand that you would like to send message to someone in Canvas. Just to let you know, that the Canvas Conversation is limited to communicating with the users in your courses only, i.e. you can send messages to students, teachers or any other user in your course. Once you are in the compose a new message screen, it would allow you to choose your course then the users in a drop down menu.
Here is a guide which will walk you through the steps of achieving this. I hope you will find this useful.
@131007 , since you are a student, please keep in mind that if the resources provided above don't work for you, it's most likely because your school district has disabled the ability of students to send messages to one another in Canvas, and if that proves to be the case, you will need to contact your teacher and school administrators for additional assistance.