Question - Why can't I send an SMS?
Answer - Check whether your contact(s) have been added successfully. You can check this by looking under the Contact List button (you should see this statement SMS: 1 text to be sent in total. You've selected 1 eligible contacts for 1 student, of which 1 numbers appear to be unique) If it states 0 go back to contacts and select them again. Next, click on the SMS button and add your text to the box. Note that as soon as you start to type, the send button will become active ready for you to send your text.
Another reason could be you may have exceeded the SMS character limit (160 characters), once exceeded the Send SMS button becomes inactive.