unknown host

Hello, I tried to go to my friends, and writes unknown host, I thought it was with me, started my server, the same thing, what should I do?
(I am Russian, wrote with the help of a translator)

Quote from ChosenFate

Try changing your DNS Server to Google's following this guide

Is there another way?

Quote from ChosenFate

Did it work?

I don’t know, but if the ways are easier, if not, I will try this one.

Quote from ChosenFate

It's the way that helps most, and it isn't really hard to do. Just read the guide, it'll 99% work

It's just hard to translate it all

It’s also not always clearly translated

Well, how will I try