They actually have nothing to do with macros.
what you do is this:
/emote <insert your text here> and it will say in the orangish chat: "<your name here> <your text here>"
Also, /e works for short.

There is no way to change your name, other then a paid name change. (costs $10)
what you CAN do, however, is type something, then hit the spacebar untill it brings you a new line, and your old text should be moved over. Then, you would type in, say,
[Guild] Uthallan: hey whatsup
so it LOOKS like someone else typed it.

ah yesm, thats what i meant! great thanks ill try out both to see if they work