this is the citation of news, where it says that I gave this text for my own?
A citation of news you were saying? Without its references its plagiarism. You've just copied and pasted it 
The text tells it's yours by posting it, but since you've just copied the contents. Then it's not really yours, you stole it.
You're busted, no more excuses please!
all clear. I did not know that. I thought that this was not considered plagiarism. I am guilty, unfortunately then