More detail please. As this is in the Programming and Design" section, it is unclear whether you are asking how to make text larger when writing a program. And if so, we would need to know what programming language you are using. The technique to do it is different in every language.

Or do you just want to make the display on your computer larger? If so, that is going to vary depending on the version of Windows you are using, or the web browser you have.

To increase size of print on screen

1st of all make sure your monitor resolution is set correctly by right click on the desktop

Left click on Screen resolution. . .

If correct, then; to increase size of the screen print hold CTRL down and run thumbwheel upwards

If no thumbwheel, Hold CTRL down and press the + key to increase, the - key to decrease