Please see: https://desk.zoho.com/portal/timmyinc/kb/articles/how-to-send-text-message-from-camp-page for a detailed information on how to send text message from camp page?
Please see: https://desk.zoho.com/portal/timmyinc/kb/articles/how-to-send-email-from-class-page to get a detailed instruction on how to send an email to a class from the classes page.