How do I change the font size on an HP computer?

I need the letters to be bigger on this computer, But HOW!!How do I change the font size on an HP computer?
If in general and if your computer is XP, go to start, control panel, appearance and themes, display, and click the appearance tab. Under the font size drop-down menu, click the size you want. Or, You can go to start, all programs, accessories, accessibility, and click magnifier to magnify certain spots on your screen.How do I change the font size on an HP computer?
In what application?
push F11 is full screen push again to go back.

in the menubar go to ';view'; than choose ';zoom';.