Internet Explorer users press ALT + Accesskey. You will also then need to press enter to activate the link.
Firefox users press SHIFT + ALT + Accesskey.
Chrome users press ALT + Accesskey.
Opera users press SHIFT + ESC - This opens the access key panel, after this opens press the corresponding access key, for example to go to the homepage you would press SHIFT + ESC then press 3
On the Mac, you would use CTRL+Accesskey (not COMMAND+Accesskey, which can produce undesired effects).
You can use your browsers built in text resize tools.
This is normally found in the top menu of your web browser, click on View and navigate to text size (aka zoom) and change to your prefered size.
Alternatively, as a shortcut in some browsers you can hold down the ctrl key and then press the plus (+) or minus (-) buttons to zoom in and out of the page.
To make it easy to find what you need just visit this page a check out the access keys list above.