Phase 1: you will need basic knowlege on how to use redstone

TO GET IT WORKING:

1.Use MC edit to put it where you whant it.

2.Connect the door to the redstone (where it goes down)

3.Put torches behind the levers that you whant as part of the code(e.g. if your code was 1-2-3-4-5 you put torches behind 1 2 3 4 and 5)

4.Enjoy

Additional Notes

DO NOT COMPLAIN THAT IT IS TO HARD!!! if you still cant do it look on youtube for how to make a code door