It's possible to top up the SMS credits for your school to SMS your school members. You can top up from several places:
Profile Menu at the top right-hand corner of the screen.
2. You can also top up from the Group Messaging section.
A pop-up will appear. Next, choose the relevant SMS plan and relevant credit card payment.
Please note that prices will vary from country to country.
That's it. You are ready to send out some SMSs!