If you browse this website on a desktop computer, a modern web browser will allow you to hold down the Ctrl key (Command key on a Macintosh) and press the + or - key to increase or decrease the text size, and 0 to go back to the default size.
On a smartphone or a tablet, you can simply pinch open on the screen to zoom in (i.e. to enlarge) and pinch close to zoom out (i.e. to reduce) everything.
You may also change the text size from the menu. Choose from the following web browsers for specific instructions: