You can change your plan at any time from the “Membership” tab on the “School Settings” page. If you’re a single teacher and you hire someone else to work with you, you can switch to the 2-teacher plan which will allow you to add an additional teacher account in My School Books.
Once you’ve upgraded your plan, use the “Teachers & Administrators” page to create additional teacher accounts. (This option only appears if you’re subscribed to a plan with 2 or more teachers.)
If you’re subscribed using PayPal, you’ll need to unsubscribe your current account first, then resubscribe with a plan that has the correct number of teachers. (Your data won’t be lost during the unsubscribe/resubscribe process.)