You are now finished! The only thing left is to program it. You can make it do whatever you want; writing HIGH to pin 13 is all you need to do to shoot it. A good test is to use the example "Blink" program, usually everyone's first Arduino program, and change "delay(1000)" to "delay(2500)".
Remember, if you have any question or suggestions, you can leave them in the comments and I will get back to you right away!