Hi Dan20,
No cheating

but here are a couple of tips:
Quote: "add two additional objects onto the game space "
I'm guessing that part of the game environment already exists and you have to add to it. One place to start might be to go through the code that already exists and see how things are being done so far.
What kind of objects do you have to add?
Quote: "Change the object in the upper left corner to also be a radar sprite"
Are they all sprites? If so, read up on the SPRITE command. You'd be amazed at just how much you'll be able to do with this one command.
You'll also have to read up a bit on images. Check out LOAD IMAGE and GET IMAGE. An image provides the graphic (picture) that a sprite can use.
The screen can be thought of as a big grid with two axes (directions), x and y . X runs from left to right, 0 starting on the far left and increasing until the far right side of the screen. Y runs top to bottom, 0 starting from the top and increasing until the bottom of the screen. The actual size depends on the resolution. You can reference (point to) different areas on the screen using the values of x and y. So if your screen resolution was 640 by 480 (X by Y) where would the center be? If you can answer that, then you're on track to being able to position your objects.
Enjoy your day.