How/where do I enter a message for my status, please?

Near the top right of the screen you will see your username and sP and stuff. Under all that stuff it says how many friends you have online. All you have to do is hover your mouse over that and a box will show up where you can type in your status :)

Move mouse over friends online, under your username, right up corner, click status, enter line, click ok, wait to save, done. :)

Thanks Saeko and March