If you don’t already have GitKraken:

Download GitKraken Git GUI

Sign Up for GitKraken Boards

Sign Up for GitKraken Timelines

Then log in via the GitKraken app, using your GitHub credentials. Make sure you've signed up for the GitHub Student Developer Pack.

If you do already have GitKraken:

Even if you are already signed in through GitHub, you will need to go to Sign into a different account and log in with your GitHub credentials.