You can use this link to access a screencast that goes through the process of creating a parent account in Canvas. A bonus is the student account will also be set up, saving your student time the first day of school.
If you rather use a document, with pictures, that takes you through the process of creating a parent account in Canvas, you can use this link.
This link can be used to access a document that will guide you through the process of creating a parent account in PowerSchool.