Manage the integration
You can manage the GitHub/Trakr integration from your GitHub account under the Applications section. It will show up similarly under an organizational account if you had installed the app on behalf of an organization.
Under the application configuration screen, you can add or remove repositories from the integration as well as uninstall the integration in its entirety.
If you have trouble finding where the app (which account) it is installed under, you can always navigate to account -> integrations under your Trakr user account screen.