Gatorules, there are a few ways you can do this. One would be to use the PASTE IMAGE command and have it paste the sprite image at a variable for the x value and a variable for the y value, then detect if the player is pressing an arrow key and, if so, then increase or decrease the x and y values accordingly. This way, the image will be pasted at the location you are specifying and can be controlled with the arrow keys.
Another method would be to use the same sort of code, but instead of PASTE IMAGE, you would use the SPRITE command. You could also use MOVE SPRITE.
Tom