Message Center and Chat

How do I add a conversation to my favorites? How do I hide a conversation? How do I leave a conversation? How do I add a great building or trade offer to the conversation? How do I mark all conversations as read? How do I create a group conversation? How do I lock a guild conversation? How do I mark a guild conversation as important? How do I delete a guild conversation? How to move topics from my Guild Forum to the Message Center? When and why is the Guild Forum being deleted? Why did my topic/messages disappear in the Message Center? How come I cannot use Guild Admin Conversations? How do I use Guild Admin Conversations? What are Guild Admin Conversations How does the automatic deletion process of important messages work?