Were do i go to report 1 single user :/

[Google]

ok
if he does not complete what he said he would do it is considered scamming and i will report it :]
thanks guys

Scamming is when you trade and the other person doesnt follow through and keeps your money. Leaving you with nothing.

If its the auction, Many people either make mistakes on the price or they didnt get what they want.

Which is why you should put a starting bid.