i dowloaded the application on the phone and dont not received the credits
You should play one game then you will receive the credits.
I've made a thread about this. Search the forum before you gonna post. And yes, Shakib is right. But sometimes you need to play more than one game to get your credits.
It's exactly near 5 games to get the credits....
My sister played 1 game and get them. But when you quit, it doesn't count.
You have to win at least 1 game using the application to receive the 20 credits. I recommend 1v1, so others don't mess up your chances of winning.