Hi Nick,
Don't worry, we were all new at one point.
I don't see the orange line in the top right like you described, but it is early in the morning here and I am sleepy so forgive me.
I just made a screen cap to show you how to figure it out, easier than typing. Use Chrome, and inspect element. Or you can use firebug with Firefox. here is the vid:
http://www.youtube.com/watch?v=eQSC-9DRErQ