Need help!!

Guys I need real help!! I have tomorrow competition and I know every thing but can you please help how to make simple program for countdown with 7 segment display but i starts to run when I push button!!
Please help!!

I know every thing

Except how to plan a project?

Well, let's see what the issues are:

  1. You waited until the day before the competition to do the project.
  2. You know everything

The second point makes me wonder why you're even posting anything here.

And maybe some knowledge of how to use google would be of benefit:

and please, read point 6. How to use this forum