How do you get the URL to your tweets?

I love entering contests. But when they call for you to tweet a specific post and then leave them the link I always forget how to do it. Ok, honestly, for a while I didn't know how to do it and spent time wondering how to do it. So now that I do I'm sharing it with you.

When you post the tweet, on your timeline click the time and it will open up to show just that post. Voilà.