The Terms of Service are available in the device when you start it for the very first time. They appear after you have selected a country. They are also displayed after a Master reset.*
You must accept the Terms of Service before you can use Yahoo! Go 3.0.
If you want to find them again later, navigate to the Yahoo! Go 3.0 site for complete information.
* For more information, see How do I reset Yahoo! Go 3.0?