You must be a District Administrator to perform this task.
To manage schools for your account, navigate to "Admin > Schools" in the main menu.
You will be shown a list of schools currently associated with your account. To add a new school, click "New".
Complete the "New School" form and click "Save."
Repeat for any additional schools in your district.
If you are syncing your SIS, the SIS School ID is a "primary key" that links all data between ion and your SIS. If you have questions about what should go in this field, please reach out to firstname.lastname@example.org.