To change the size of the web page on your screen. 
 

(If you have a mouse with a scroll wheel)

Internet Explorer, Firefox, Opera, Safari and Netscape
Hold down the CTRL key and rotate the mouse scroll wheel ...slowly! - (Scroll down makes web page smaller, scroll up make web page larger!)
Info: The same tip works on your desktop making the Icons bigger, but don't go overboard or it can look very untidy.

OR
(If no scroll wheel )

Internet Explorer, Safari, Firefox, Netscape
Hold down the CTRL key on your Keyboard and press either, + key to make screen bigger, or - key to make screen smaller.

Opera
hold down SHIFT key on your keyboard and press + to make screen bigger, press - key on it's own to make screen smaller.
Info: If you make the screen too large you will need to scroll around to see all the screen, menu options and whole pages. 
 

To change the size of the text only

INTERNET EXPLORER:
Go to Menu Bar at top of the page and click on,
View
Text Size
Largest

FIREFOX, NETSCAPE & SAFARI
Go to Menu Bar at top of the page and click on,
View
Zoom
Zoom Text Only

Then, hold down the CTRL key on your Keyboard and press either, + key to make letters bigger, or - key to make letters smaller.