Talking via Messages and FaceTime - Teach Yourself Visually Complete Mac Pro - page 252

Configure Messages
Change Your Picture
Add a Messaging Account
Set Your Status
Disable Read Receipts
Send a Message
Add a Buddy
Start a Text Chat
Start an Audio Chat
Send a File in a Message
Sign In to FaceTime
Connect Through FaceTime
Mute FaceTime
Turn Off FaceTime