How to change web page size?

You can zoom in and out using Ctrl and + or -.

You can also try changing the compatability view. Here's what the Help page says:
Why don't some websites display correctly in Internet Explorer?


Websites designed for earlier versions of Internet Explorer might not display correctly in the current version. Often, you can improve how a website looks in Internet Explorer by using Compatibility View.
When you turn on Compatibility View, the webpage you're viewing—and other webpages within the website's domain—will be displayed as if you were using an earlier version of Internet Explorer.
If Internet Explorer recognizes a webpage that isn't compatible, you'll see the Compatibility View button on the Address bar.

To turn Compatibility View on or off, click the Compatibility View button, or follow these steps:

1. <LI class=step> Click to open Internet Explorer.
2. Click the Tools button, and then click Compatibility View.

Notes

• The website will be displayed in Compatibility View until you turn it off or the website is updated to display correctly in the current version of Internet Explorer.

• Website display problems can also be caused by an interrupted Internet connection, heavy traffic, or issues with the computer code used to create the website.

• If a website is compatible with the latest version of Internet Explorer, you might not see the Compatibility View button, or the Compatibility View menu item might not be available.

Article ID: MSW700029

What I do is press and hold control, then scroll my mouse, the middle scroll wheel to change size.

The key labeled "Ctrl" there should be one at the bottom left and bottom right of your keyboard.

Is it only on this site or other sites? If only on this site, then as others have said CTRL + + or - should do the trick. Otherwise, it may be a computer setting which you have to look into.