Navigate to the chat tab of the Yay mobile app. On the device, press the plus icon in the lower right corner to start a new chat.
You'll see all of your contacts, both internal and from your phone books under here.
Once you've selected your contact, type out your message and press send.
If you need any further help today, please don't hesitate to contact our friendly support team on 0330 122 6000 or by email!