Add people as friends, and when they are on facebook, they will appear in the Chat menu in the bar at the bottom. Click on someone's name to chat with them.
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It means you can chat to people on Facebook who are your friends and are online when you are.
Sometimes the Facebook chat can disappear due to a glitch with Facebook. Try closing out Facebook and clearing your browser cache and then restart the application.
You spelt messenger wrong. And you don't 'do' images on Facebook Chat (there's no such thing as Facebook Messenger, I assume you are referring to Facebook Chat) as it is impossible. Email images, post them on Facebook, send them in the post. On Facebook Chat, you can only have conversations. Just get MSN. Idiot.
It has to be on facebook chat, and you type in thiings like :) or ;) or :(
Facebook App from the Apple app store.