There are two options to get parent codes from eBackpack to provide to your students' parents.
The first is accessible to both superusers and non-superuser staff.
From within each class, select the Roster Tab and click on the Parent Codes icon in the top bar. This will download a PDF to your computer with all of that class' students and his/her parent's code.
The second option is only accessible to superusers. This option allows the superuser to perform a mass export of all parent codes for your student body. From Account Settings, select Account Management -> Feature Settings -> Parent Connection and click on the link to download a CSV file of all students and their parent code