@mariaxxl

1. Go to user's profile
2. Click on the first tab called Feedbacks
3. Click Submit Feedback for User
4. In the first box You were the: you can choose
Buyer : if you won his giveaway
Seller : if you sell him something
Trade : if you trade an invite/account/etc with a user

5. In the second box Overall experience:
you pick Positive (+1) if all were fine or Negative (-1) if something went wrong

6. In the last box A short comment : you can add anything you like like a thanks BUT DONT mention tracker's name cause sometimes its risky