Things You'll Need
Instructions
Open the player’s gamer profile. Here you will see their information, community rating, and other information.
Select “File Complaint” and press the A button.
Choose “Tampering” as the general reason for your report, and on the following menu select either “System Tampering” or “Cheating.”
Select “File Complaint” to complete the process. The Microsoft Xbox Live team will investigate your report and take the appropriate actions based on their findings.