On my Transformer with Honeycomb... the top right corner has an "Apps" icon. Click on it and you should be able to find the default Asus Browser.
(if you want to move your browser's icon to another spot, hold down on the icon and after 1 second you should be able to move your icon within or across the screen)
If you want to download and use another browser, use the Market app to look for more browsers.
I'm currently using Opera Mobile.