click button more time.

I have problem about click button. I create 12 buttons for click, it a Thai letter, and I want to participants remember letter that show on screen 2 - 6 letters and then they must to click on letter button follow order that letter show on the last screen. (matrix 4 x 3 button ) I want to know that how did i do? because when I click on button one time ,it change screen to next trial. I want to click more time on one trial.
thank for suggestion
Surachate Phinitkit

What type of Participant Input are you using for the experiment? Are you wanting to see what the participant presses on the screen as they press? If you do have your experiment it might be helpful for me to see it. If you can, please post your experiment as an Experiment Package. This is found under the File menu within SuperLab.