A lot of people are having this problem. Luckily for you, it's not a big one.
Import your graphic. A box will show up.
Import your graphic. A box will show up.
The color that you click on will be transparent in game.
That's all there is to it. Good luck on your project!
That's all there is to it. Good luck on your project!
(someone please sticky this, the amount of times this has been asked is just annoying to no end--to the point where it obviously isn't doing any good in a FAQ topic or anything)