First, when you open it, make sure it's on RGB Color. Then there should be a paint can in the Toolbox that should pop up. Change the color to black and then you can make the background back -- But if it's FH you might want to use regular old paint brush because the paint filler only fills that section of whatever it is. They're should also be a Text option in the toolbox you can press. c: Good luck!
Kiri~