Sounds like you're new to these forums, and you're getting through lond and clear: Welcome aboard Wrong Planet. As another newly diagnosed member, I can surely relate to that "well that explains why such-and-such-and-such..." kind of feeling...!
On the post subject you've written: I've never used a chat B4. How does this work?
This place is, strictly speaking, not a chat, but a forum. Think of it as a bulletin board, where everyone who's signed up as a member, can put up notes, and write replies onto existing notes. In this case, you posted the "initial" slip, and soon enough some of us "regulars" drop by, sees your note, and starts jotting down friendly little "hello's" like this one...