2012-08-29 7:37 - edited 2012-08-29 7:41
Thank you for your post. Please ensure you have internet connection on your device then try to browse with the stock browser.
Press the Navigation key.
Scroll to Nokia Browser and press the Navigation key.
Scroll to the address bar and press the Navigation key.
Key in http://m.youtube.com and press the Navigation key.
Look for your videos and watch them.
You can also try this if that is easier for you.
Hope this helps, let us know how you get on,