GUI Page link problem

Hi I have got a problem with my GUI for MATLAB. I have a quiz and after each question, a page pops up with 4 boxes. The player chooses a box and an amount of money appears as a string. I want the amount of money showed in the box to appear in the next question page and this amount is updated at each question page after a money box has been chosen.

I am having difficulty doing this.

Thank you.