can't watch you tube on my nokia c3!

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waaaaahhhhhh! I can't watch Youtube on my nokia C3. I was okey with it because my aunt wasn't also able to watched on her mobile (she also have c3), that was months ago. But yesterday my cousin told me that her cousin was able to watch, she just connected by just typing www.youtube.com, I tried it then also type www.m.youtube.com but can't still watch. :( any tips? Our wifi is tp link. watched some guy in you tube demonstrate/troubleshoot but he configure his wifi and he lost me there. do you have any tips?