Have your student log in to Edmodo. On the bottom left side panel is the parent code for your child. You will need that code to set up a parent account.
Go to edmodo.com
Click on "I'm a Parent" and sign up.
Here is a link for other information about the Parent Account. Parent Account Information
One of the first things that you'll want to do is to edit your notifications. Here's some information about your settings. Info about settings
Here's some of the information that you will be able to see about your child. Parent Info About Child