How is it hard? It took me less than a minute to figure out where to place the code.
Use your brain (if it's there)
Guys name is NASCasino.com, so obviously that's the domain. Sign up & confirm email.
On the right click your name, and go to bonuses. Then you get an option to enter the code.
The code he gave is the promo code but it can't be used without the last missing numbers.