So far making a green release is the achievement most people unlock in this game, so all you have to do is get your line in the center of the yellow part on the line area. To have the best chance of making this get a player wide open, or be 10% or less covered. Then aim for the line, my first shot in this game was actually green in a play now game. Now don't worry if this didn't work out just keep trying to hit that center part and eventually you will get it and the 15 gamerscore achievement.