Okay, I'll give this a shot. Pretty simple, I just get my directions messed up a lot
Someone can fix this if they want to, but this is basically it:
//Let's assume your movieclip is called MC, and you changed _rotation to change your object's angle.
//Say, this var represents distance in pixels.
var SPEED = 5;
//It would be one pair of these two lines, I'm not sure which:
MC._x += Math.cos(MC._rotation)*SPEED;
MC._y += Math.sin(MC._rotation)*SPEED;
MC._x += Math.cos(MC._rotation/180*Math.PI)*SPEED;
MC._y += Math.sin(MC._rotation/180*Math.PI)*SPEED;
But, just so you know:
Up is not zero degrees. Right is. I think down is 90, and it goes around that way, but I'm not sure.
I hope my code helped, it probably won't work, but at least it's something.