The latest versions of several Web browsers (e.g., Internet Explorer, Firefox, Safari) allow users to easily increase the font size for better readability. Try holding down the Ctrl key (Command key on a Macintosh) and press the + (plus) key. You can also decrease the font size by holding down the Ctrl or Command key and pressing the - (minus) key.
If that is not effective, you may be using an older version of Web browser. You may find instructions on the Web Accessibility Initiative Web site to be helpful. If you are still not successful, you might consider upgrading to the latest version of your browser.