how to change dns in suse linux 11.3

I don't know how to change the dns to the dns of Google 8.8.8.8 as primary and 8.8.4.4 as secondary

so how can i change the dns?

Could you please tell step by step.. I am a new user and the pictures will be the best!

p.s.: I am from Turkey, Twitter is banned in my country. I have to use it:(