You mean make words appear bigger? I don't know if you can change the text from "Times New Roman" to some else as they are already there. But if you want make words look bigger, press "Ctrl" on your keyboard and scroll you mouse.
As stated, you can't change the font type but you can change the font size.
Press 'Ctrl' and scroll the mouse up to zoom in, and down to zoom out.
To restore the original size, Just press 'Ctrl and 0' simultaneously.