Your Blacklist lets you control who you do and don't trade with.
If you blacklist another member, they won't be able to bid or ask questions on your auctions.
You don't need to give a reason why you're blacklisting someone, and other members can't view your Blacklist.
To add someone to your blacklist, go to My Blacklist in My Trade Me and add the username of the member you'd like to block. If you copy and paste their name from the site, make sure to only copy the username and not the feedback rating.
To remove someone from your Blacklist, click the 'Remove' option next to the member's username.