Search:

You need to talk to the person(s) that wrote the program you are using. Ask them how to do what you want.

That could require changing the code. Do you have a programmer to do that?

If you don't know how to code java, how are you going to change a java program?
The size of the letters a java program displays is controlled inside of the code.

Please copy and paste here the code for your program that shows your problem. Be sure to use code tags:
wrap your code with
<YOUR CODE HERE> to get highlighting